The New Yorker's Ryan Lizza provides a profile of Rep. Paul Ryan, with a rich discussion of his vision for limited government. It's a good read, but it left me thinking about what it is that troubles me most about Rep. Ryan, an earnest guy who's come a long way and influenced a lot of people at a relatively young age. The problem is his numbers don't add up. And that's a particularly big problem for a celebrated budget wonk. It's actually not hard to write down plans that purport to quantify Ayn Randian visions. But we should beware of politicians pumped up on ideological visions stoked by novelists and fairy tales about how slashing taxes and spending sets us free. The world is more complicated than that.