When Newark Mayor Cory Booker (D) went off-message and defended private equity during a "Meet the Press" appearance in May, many Democrats were angry and Republicans used him in their attack ads. And while Booker is standing by his comments, he admits in a Wall Street Journal interview published Monday that he visited the president shortly after the flap to explain himself.

"I wanted to talk to him about. I went to talk to him about. I could see, he's the president and he just knows me … It's all small potatoes," Booker said.

The longtime Obama supporter told the Journal that he "spoke from the heart" when he refused to criticize Mitt Romney's tenure at the helm of private equity firm Bain Capital.

"I could have expressed the same idea in a way that could not have been used by the Republican Party and misconstrued as a direct attack on the president," Booker said. "But the reality is that I stand by what I said. I've never been comfortable with the tone or tenure of negative campaigning."

Booker's controversial comments on "Meet the Press" came as the Obama campaign was escalating its attacks on Romney's record as CEO of Bain Capital and whether the presumptive presidential nominee oversaw the outsourcing of certain companies in the firm's portfolio.

"This kind of stuff is nauseating to me on both sides," Booker told host David Gregory. "It's nauseating to the American public. Enough is enough. Stop attacking private equity."

Hours after the Sunday show aired, Booker attempted to clarify his departure from the Obama campaign's talking point on Twitter and in a YouTube video.

Days later, Romney's campaign released a minute-long compilation of Democratic politicians, including Booker, standing up for the private equity industry. The web video concluded that "even Obama's own supporters have had enough."

Also on HuffPost:

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  • SEC Filings List Romney As 'Chief Executive Officer'

    According to the <em><a href="http://www.boston.com/news/politics/articles/2012/07/12/government_documents_indicate_mitt_romney_continued_at_bain_after_date_when_he_says_he_left/" target="_hplink"><em>Boston Globe</em></a></em>, Securites and Exchange Commission documents filed by Bain Capital after February 1999 list Romney as the private equity firm's "stole stockholder, chairman of the board, chief executive officer, and president."

  • $100,000+ Salary

    The <em><a href="http://www.boston.com/news/politics/articles/2012/07/12/government_documents_indicate_mitt_romney_continued_at_bain_after_date_when_he_says_he_left/" target="_hplink">Globe</a></em> also found financial disclosure forms filed by Romney that indicate he still owned 100 percent of Bain in 2002, and earned at least $100,000 as an "executive" for the firm in 2001 and 2002.

  • 2002 Testimony

    As <a href="http://www.huffingtonpost.com/2012/07/12/mitt-romney-bain-departure_n_1669006.html?utm_hp_ref=politics" target="_hplink">The Huffington Post</a> reported, sworn testimony given by Romney in 2002 undermined his claims that he left Bain in 1999. In that testimony, given as part of a hearing to determine if he had sufficient Massachusetts residency to run for governor, Romney said that he "remained on the board" of the LifeLike Co., which Bain held a stake in at the time. LifeLike's 2000 <a href="http://www.sos.state.co.us/biz/ViewImage.do?fileId=20001165127&masterFileId=19961077091" target="_hplink">corporate filing</a>, filed with the state of Colorado, lists Romney as a director.

  • More SEC Filings

    HuffPost's Jason Cherkis and Ryan Grim identified at least <a href="http://www.huffingtonpost.com/2012/07/13/mitt-romney-bain-sec_n_1671819.html" target="_hplink">six documents</a> filed by Bain Capital with the SEC from 1999 to 2001 that were signed by Mitt Romney. Most of the documents refer to Romney as the "reporting person."

  • 'Managing Member' In 2002

    HuffPost <a href="http://www.huffingtonpost.com/2012/07/15/mitt-romney-bain-capital_n_1674209.html?utm_hp_ref=politics" target="_hplink">reported</a> on a 2002 corporate document filed with the state of Massachusetts that shows Romney listed as one of two managing members of Bain Capital Investors, an entity of the private equity firm.

  • Signed Documents After 1999

    Romney signed an SEC filing in November 1999 pursuant to Bain's partial acquisition of medical-waste firm Stericycle, <em><a href="http://www.motherjones.com/politics/2012/07/mitt-romney-bain-financial-disclosure" target="_hplink">Mother Jones</a></em> reported. The filing noted that he was the "sole shareholder, Chairman, Chief Executive Officer and President" of the Bain entities involved in the $75 million deal.

  • 2001 & 2002 SEC Filings

    <a href="http://talkingpointsmemo.com/archives/2012/07/no_romney_didnt_leave_bain_in_1999.php" target="_hplink">Talking Points Memo</a> uncovered two SEC filings from July 2000 and February 2001. In both, Romney lists his "principal occupation" as "Managing Director of Bain Capital, Inc."

  • 1999 News Reports

    As Slate's <a href="http://www.slate.com/blogs/weigel/2012/07/13/did_the_romney_campaign_create_the_swift_yachting_story_.html" target="_hplink">Dave Weigel</a> pointed out, Romney's campaign has cited news reports from 1999 that clearly state that Romney left Bain in 1999. However, those same news reports state that Romney would still be involved with the company. "Romney said he will stay on as a part-timer with Bain, providing input on investment and key personnel decisions," read one such report from the <em>Boston Herald</em>

  • Former Partner Speaks Out

    A former Bain Capital partner, Ed Conard, said during an appearance on MSNBC's "<a href="http://upwithchrishayes.msnbc.msn.com/_news/2012/07/15/12751962-former-bain-capital-partner-says-romney-was-legally-ceo-of-bain-capital-until-2002" target="_hplink">Up W/Chris Hayes</a>" that Romney was "legally" the CEO and sole owner of Bain Capital until 2002, as an ownership battle dragged on after Romney left to take over the Salt Lake City Olympics. "We had a very complicated set of negotiations that took us about two years for us to unwind. During that time a management committee ran the firm, and we could hardly get Mitt to come back to negotiate the terms of his departure because he was working so hard on the Olympics," Conard said.

  • Relationships With Problematic Companies

    HuffPost's Sam Stein <a href="http://www.huffingtonpost.com/2012/07/16/mitt-romney-bain-capital_n_1677133.html" target="_hplink">reported</a> that SEC filings link Romney to politically problematic companies after his alleged 1999 departure from Bain: <blockquote>A Huffington Post review of SEC files unearthed six separate occasions in which Romney was listed as a member of "the Management Committee" of both Bain Capital Investment Partners and BCIP Trust, "deemed to share voting and dispositive power with respect to" shares held of DDi. In one of those filings, Romney is listed as president and managing director of Bain Capital, Inc. The dates of those filings range from April 14, 2000 to May 10, 2001 -- all after Romney had left for Salt Lake City. In one March 2001 filing, Romney signed the document as the "reporting person."</blockquote>

  • 'General Partner'

    According at a <a href="http://www.huffingtonpost.com/2012/07/16/mitt-romney-bain_n_1677259.html" target="_hplink">document</a> filed with the California Secretary of State's office in July 1999, Romney was listed as a "general partner" at Bain Capital Partners. Romney's signature appears on the document. Romney remained on record as a general partner until California was notified of his resignation in June 2003.