WASHINGTON -- Vice presidential candidate Paul Ryan asserted on multiple occasions Tuesday morning that the numbers behind the Romney campaign's tax plan add up.

They don't, though allied conservative groups are now rushing to help fill in the details.

The Wisconsin Republican was asked during a sit down with Bloomberg News why he was offering specifics when it came to the goodies of the tax plan -- a 20 percent across-the-board deduction of rates, a ten percent reduction of the corporate tax rates, a repeal of the estate tax -- while detailing none of the bitter pills -- the deductions and exemptions that must be eliminated to make the proposal deficit neutral.

"You don’t say to Congress, to Democrats, that you want to work with, 'Take it or leave it, it's everything, it's all my way or the highway," Ryan responded.

Pressed about a Tax Policy Center analysis which said that the Romney plan would have to raise taxes on the middle class (by eliminating their exemptions and deductions) in order to be deficit neutral, Ryan told Fox News on Sunday that he couldn't go through all the details of the tax proposal in the time allotted. But on Tuesday, he didn't get into the minutia. He just insisted that the framework put together by the campaign has been proven to work.

"Obviously," Ryan said, "the numbers add up, we have shown that."

"What we are saying is, by subjecting higher income earners' income to more taxation, remove tax shelters, lower deductions for higher income people, more of their income is subject to taxation so you can lower tax rates for everybody across the board and shelter the middle class from any kind of tax increase. There is obviously enough fiscal space to lower tax rates 20 percent, keep these middle-class preferences," Ryan added. "We have shown how that works."

The idea that the government could lower tax rates across the board and fill the gap by eliminating loopholes, deductions and exemptions isn't entirely radical. It's the basis of the tax section of the bipartisan Simpson-Bowles proposal. But to insist that the math works, one has to offer numbers. And while Ryan may argue otherwise, the Romney campaign has steadfastly refused to pinpoint the exemptions and deductions that it would be fine eliminating.

Even Romney's campaign seems to be confused about how the math will work. Last week, Kevin Hassett, a Romney economic adviser, suggested that the candidate would scale back the 20 percent tax cut if he couldn't find the deductions and exemptions to help pay for it. Shortly after, Romney told a largely middle-class crowd in Ohio that they shouldn't be expecting too much tax relief because he would be going after their exemptions and deductions.

And yet, conservative think tanks are doing their best to help provide the candidate some cover. On Tuesday, the American Enterprise Institute produced another analysis arguing that Romney could have his 20 percent cut without raising taxes on the middle class. Past studies that the Romney campaign has cited as supportive have said that exemptions and deductions on income above $100,000 would have to be eliminated in order to make the math work.

AEI insists that if you set Romney's plans for health care reform aside, the numbers are more favorable to him. AEI also argues that if "the economy were to grow just 0.1 percentage point faster per year as a result of the [Romney tax] reform" then Romney's tax plan could be revenue neutral without additional taxes on the middle class.

Neutral budget analysts would likely quibble with these assumptions. But they do represent a more detailed framework than what the Romney campaign has offered to date.

Earlier on HuffPost:

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  • King Tut's Penis

    Seriously, we know more about a 3,300-year-old teen pharaoh mummy penis than we do about what lies carefully preserved in Romney's tax returns before 2010. That's either because we <a href="http://www.newscientist.com/blogs/culturelab/2010/06/on-the-trail-of-tutankhamens-penis.html" target="_hplink">know a fair amount about King Tut's mummified member</a> -- like the fact that it broke off and went missing for a while -- or because we know absolutely nothing about the pre-2010 presidential candidate's tax returns.

  • Coca-Cola's Secret Formula

    Despite the presence of a number of <a href="http://en.wikipedia.org/wiki/Coca-Cola_formula#Purported_secret_recipes" target="_hplink">purported recipes</a> for Coca-Cola, the company has long maintained that there is only a single copy of the actual formula, kept stashed away in a safe place. Last year, however, Coke <a href="http://www.thecoca-colacompany.com/dynamic/press_center/2011/12/coca-cola-secret-formula-moves-to-the-world-of-coca-cola.html" target="_hplink">moved its secret formula</a> to a vault housed at the World of Coca-Cola in Atlanta. Sure, it was only a token step toward disclosure -- and probably more about making money -- but at least it was something. Your move, Mr. Romney.

  • The Bermuda Triangle

    This region may be great for <a href="http://www.vanityfair.com/politics/2012/08/investigating-mitt-romney-offshore-accounts" target="_hplink">stashing tons of Romney's money</a>, but it isn't some sort of <a href="http://en.wikipedia.org/wiki/Bermuda_Triangle" target="_hplink">isosceles zone</a> of supernatural trickery. Detailed reports of notorious shipwrecks in this area have led most experts to conclude they were caused by bad weather, rogue waves or simply human error.

  • How To Speak Prairie Dog

    <a href="http://www.youtube.com/watch?v=y1kXCh496U0" target="_hplink">Those noises</a> might sound like just a bunch of annoying, high-pitched chirps, but <a href="http://news.bbc.co.uk/earth/hi/earth_news/newsid_8493000/8493089.stm" target="_hplink">Professor Con Slobodchikoff of Northern Arizona University has more discerning ears than you</a> -- and probably a cooler name, too. Slobodchikoff says the language of the prairie dog is the most complex of any animal decoded so far. The varmints (which Romney <a href="http://www.youtube.com/watch?v=w-iRlBH3G6A" target="_hplink">may or may not enjoy hunting</a>) even have different calls for different predators. According to Slobodchikoff's studies, prairie dogs can alter their pitch and frequency to specify the size and distance of whatever is approaching.

  • Donald Trump's Mystery Hair

    Trump and Romney might have a lot of things in common -- their mutual <a href="http://abcnews.go.com/blogs/politics/2011/04/since-president-obama-released-his-birth-certificate-will-donald-trump-release-his-tax-returns/" target="_hplink">fear of releasing tax returns</a> comes to mind. But when it comes to coiffure, they are worlds apart. There have long been questions about Trump's hair. Mainly, "What is that thing on Donald Trump's head?" Well, according to him, it's just hair, carefully manicured and positioned every morning so as to make sure that no mortal can ever catch a glimpse of his forehead. From what we know, there's actually only been <a href="http://www.youtube.com/watch?v=ezz1BkuE1Qg" target="_hplink">one known sighting</a> of that part of his body. Here's what Trump <a href="http://www.rollingstone.com/culture/news/donald-trump-lets-his-hair-down-20110511" target="_hplink">told <em>Rolling Stone</em></a> about his hair: <blockquote>"OK, what I do is, wash it with Head and Shoulders. I don't dry it, though. I let it dry by itself. It takes about an hour. Then I read papers and things. This morning I read in the <em>New York Post</em> ... I also watch TV. I love Fox, I like Morning Joe, I like that the Today show did a beautiful piece on me yesterday -- I mean, relatively speaking. OK, so I've done all that. I then comb my hair. Yes, I do use a comb ... Do I comb it forward? No, I don't comb it forward ... I actually don't have a bad hairline. When you think about it, it's not bad. I mean, I get a lot of credit for comb-overs. But it's not really a comb-over. It's sort of a little bit forward and back. I've combed it the same way for years. Same thing, every time."</blockquote>

  • Area 51

    Like Mitt Romney's tax returns, this Nevada military base is shrouded in a thick veil of secrecy. While there is undoubtedly a lot of stuff going on in there -- most of it likely far more interesting than Romney's tax history -- Americans aren't completely in the dark about the base. Since acknowledging the existence of the Air Force base, the government has predictably been hush-hush about projects at the facility. Historians have, however, have <a href="http://books.google.com/books/about/Shadow_Flights.html?id=cmMBAAAACAAJhttp://books.google.com/books/about/Shadow_Flights.html?id=cmMBAAAACAAJ" target="_hplink">written books</a> about Area 51's less juicy past. No aliens or UFOs, just some <a href="http://www.latimes.com/entertainment/la-mag-april052009-backstory,0,5104077.story" target="_hplink">advanced flight technology</a> and military procedures that have gone awry at times. But that doesn't rule out the possibility that there's a lot more going on there now. Alien spacecraft? Energy weapons? A time travel project? Your imagination's the limit. In a way, the government's approach to releasing information about Area 51 seems a lot like Romney's strategy for releasing his tax returns. Release a few boring details -- like your 2010 and 2011 forms -- only to keep everything else, presumably the most interesting stuff -- under wraps. When people ask what's going on back there, just tell them to pipe down and mind their own business. As with Area 51, Romney's method is proving an awful way to quiet speculation.

  • What Space Smells Like

    Do Mitt Romney's tax returns smell like "seared steak, hot metal and welding fumes"? If they did, they'd smell just like <a href="http://www.huffingtonpost.com/2012/07/22/what-does-space-smell-like_n_1691642.html" target="_hplink">space</a>, according to astronaut spacewalk veterans.

  • The God Particle

    <a href="http://www.huffingtonpost.com/2012/07/03/higgs-boson-explained-god-particle_n_1645732.html" target="_hplink">The God particle</a>. <a href="http://en.wikipedia.org/wiki/Higgs_boson" target="_hplink">The Higgs boson</a>. You say "potato," I say "potah ... Whaaa, come again?" To make a very long and nerdy story over-simplistically short, a bunch of really smart theoretical physicists have used a multi-billion dollar piece of equipment to prove the existence of the particle that gives mass to other elementary particles. They did this by blasting things at each other at near-light speed around a 17-mile tube track of death (or life?) located in a subterranean bunker in Europe. Is it possible that a mini hadron collider is listed as an expense on Romney's tax returns?

  • Why Sloths Are Bad At Balance And Stuff

    If the captains of the animal kingdom were picking species to partake in what Mitt Romney might call "sport," three-toed sloths might get picked dead-last -- unless that sport somehow hinged entirely upon being incredibly cute. Not only are these sloths lethargic, but they're clumsy, which is actually not a problem because they pretty much only come down from trees to poop. Because their slow-motion lifestyles afford them the luxury of being able to survive without a good sense of balance, the semi-circular ear canals that control their equilibrium <a href="http://www.huffingtonpost.com/2012/08/01/sloth-balance-bradypus-variegatus_n_1728811.html" target="_hplink">have never been honed by the evolutionary process</a>.

  • What Dinosaur Sex Looked Like

    So <em>that's</em> what it looked like, at least according to <a href="http://www.huffingtonpost.com/2012/07/09/dinosaur-sex_n_1659391.html" target="_hplink">Beverly Halstead, an Englishman </a>known for his candid talk about dinosaur mating before his death in 1991. Figuring out the "cloacal kiss" based on fossils from the Cretaceous Period must have been difficult. But it was still easier than guessing what Romney's tax returns might look like.

  • How To Survive The Zombie Apocalypse

    While <a href="http://www.huffingtonpost.com/2012/06/01/cdc-denies-zombies-existence_n_1562141.html" target="_hplink">they tell us</a> zombies aren't real ... <em>yet</em> ... that doesn't mean people aren't preparing like there's a brain-starved horde headed straight for their front door. Countless books, movies, TV shows, comics and websites provide entertainment and ideas about the best way to make it through Apocalypse Z without becoming a zombie. The Centers for Disease Control and Prevention has <a href="http://www.cdc.gov/phpr/zombies.htm" target="_hplink">hopped on board as a joke</a>, but the government's <a href="http://blogs.cdc.gov/publichealthmatters/2011/05/preparedness-101-zombie-apocalypse/" target="_hplink">preparedness guide</a> appears to be taking it pretty seriously. Too bad the CDC is only serving up a barebones list of recommendations. Wait, why do we care about a presidential wannabe's tax returns again? I'm going to draw up a contingency plan.

  • What Ryan Lochte's Mom Knows About His Sex Life

    Ike Lochte seems to know too much about her swimmer son's "<a href="http://www.huffingtonpost.com/2012/08/02/ike-lochte-ryans-mom-talks-one-night-stands-single-girlfriend-today-show_n_1733433.html" target="_hplink">one-night stands</a>." Way too much. Like "the opposite of how much we know about Romney's tax returns" too much.

  • Mitt Romney's Car Elevator

    Romney reportedly shelled out $55,000 to install a top-of-the-line "Phantom Park" car elevator in his California beachfront mansion, which will allow him to "<a href="http://abcnews.go.com/blogs/politics/2012/05/mitt-romney-ordered-55000-phantom-park-car-elevator-designer-says/" target="_hplink">maintain a hands-on relationship</a> with his machines," according to the maker. Sounds kinky. Kinky enough to make me want to read more tax returns. Oh Romney -- you <em>tease</em>.

  • President Obama's Annoying Stoner Habit

    Barack Obama was a cheeky kid who refused to observe proper stoner decorum, but author David Maraniss writes in Obama's biography that he pretty much got away with it. Here's <a href="http://www.huffingtonpost.com/2012/05/25/obama-pot-smoking-details_n_1545904.html" target="_hplink">a passage that describes</a> the future president's behavior while a member of the "Choom Gang" at his Hawaii high school. <blockquote>"When a joint was making the rounds, he often elbowed his way in, out of turn, shouted 'Intercepted!' and took an extra hit."</blockquote> We also know a little bit about Romney's adolescence. Primarily that he was kind of <a href="http://www.washingtonpost.com/politics/mitt-romneys-prep-school-classmates-recall-pranks-but-also-troubling-incidents/2012/05/10/gIQA3WOKFU_story.html" target="_hplink">a jerk</a>. More tax returns might be able to prove to the nation that he's changed a lot since then, though it's hard to think that he isn't scared they'd actually do the opposite.

  • Magnets

    <a href="http://knowyourmeme.com/memes/fcking-magnets-how-do-they-work" target="_hplink">Sorry juggalos</a>, we're pretty sure the scientists <a href="http://en.wikipedia.org/wiki/Magnetism" target="_hplink">are right</a> about this one. It's all about the magnetic fields.

  • Easter Island's Moai

    These monoliths are frequently touted as some of earth's greatest mysteries. That's because people are lazy. Researchers actually know a lot about these gargantuan rock statues. National Geographic did a <a href="http://video.nationalgeographic.com/video/national-geographic-channel/full-episodes/explorer/ngc-easter-island-underworld/" target="_hplink">lengthy series</a> on the studies of ancient Easter Island culture, and recently announced that it may have explained one of the biggest remaining unknowns: How the moai were transported. According to a <a href="http://news.nationalgeographic.com/news/2012/06/120622-easter-island-statues-moved-hunt-lipo-science-rocked/" target="_hplink">new theory</a>, they were carved so they could be rocked back and forth, or "walked," to their destination. It would have required a lot of man power, but no trees, which the island lacked for a number of years. At least that's what the archaeology suggests. The visual comparison to the left, however, makes a compelling argument that Romney could have more direct knowledge about the mighty moai.

  • How Alicia Silverstone Feeds Her Baby

    She "<a href="http://www.huffingtonpost.com/2012/03/29/alicia-silverstone-premastication-pre-chew-food_n_1389544.html" target="_hplink">premasticates</a>." That means she chews her food and spits it into the mouth of her son, who's named "Bear Blu," for some reason. Just like a bird. Thirty years of Romney's tax returns couldn't make you un-know that.

  • Amelia Earhart's Final Resting Place

    The answer to this one may be as boring as Mitt Romney wants you to believe his tax returns are. While it's exciting to concoct theories about Earhart being captured, executed, or actually <a href="http://tighar.org/Projects/Earhart/Archives/Books/BookReviews/earhartsurvive.html" target="_hplink">surviving to assume another identity</a> and live out her life in the great state of New Jersey, the far more likely scenario is that she perished on a remote tropical island in the southwest Pacific. Discovery <a href="http://news.discovery.com/history/amelia-earhart-resting-place.html" target="_hplink">reports</a> that researchers believe evidence found on the island of Nikumaroro suggests Earhart and her navigator, Fred Noonan, died there after an emergency landing. In 1940, a British Colonial Service found skeletal remains on the island consistent with a woman of European descent. Near those bones lay a woman's shoe, an empty bottle and a sextant box for a piece of equipment similar to the one Noonan had used. According to Discovery, they "likely eventually succumbed to any number of causes, including injury and infection, food poisoning from toxic fish, or simply dehydration," at which point their bones may have been picked clean and carried off by enormous coconut crabs.

  • John Boehner's Tan

    If you believe House Speaker John Boehner (R-Ohio), his tan is natural, thanks entirely to genetics, <a href="http://www.politicsdaily.com/2010/09/08/john-boehner-defends-his-famous-tan/" target="_hplink">lawn-mowing</a>, mountain biking and a heavy dose of golf. "I have never been in a tanning bed or used a tanning product," he <a href="http://www.huffingtonpost.com/2010/09/23/john-boehner-tanning-bed_n_736897.html" target="_hplink">said in a 2010 interview</a>. In the absence of any other evidence, we'll have to take his word for it. In this case, it doesn't bother me in the slightest.