Newt Gingrich has “no idea” what that robocall is about, Ron Paul wants an apology, Wisconsin has some recall challengers and Elizabeth Warren is on the attack.

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* Former House speaker Newt Gingrich denies any knowledge of a robocall put out by his campaign claiming Mitt Romney refused to fund kosher food for Holocaust survivors in nursing homes as governor of Massachusetts. “I have no idea what you're talking about,” he said when asked about the ad. “Can’t comment on something I don’t know about.”

* A supporter of Texas Rep. Ron Paul got into an altercation with Gingrich’s staff in Florida today, and said that a Gingrich supporter or security worker intentionally stomped on his flip-flopped feet. The Paul campaign is demanding an apology from the Gingrich campaign.

* Iowa Republican Party Chairman Matt Strawn is stepping down from his post after three years. He did not mention it in his resignation letter, but Strawn is leaving after a three-week GOP caucus results certification process that ended with confusion over the winner.

* Gov. Scott Walker isn’t the only Wisconsin Republican facing a recall this spring. Democrats have named challengers for three state Senate recalls: Former Sen. John Lehman will run against Sen. Van Wanggaard; Rep. Donna Seidel will run against Sen. Pam Galloway; and former Rep. Kristen Dexter will run against Sen. Terry Moulton. 

* Massachusetts Senate candidate Elizabeth Warren (D) is using an upcoming vote on the tax loophole-closing “Buffett Rule” against Sen. Scott Brown (R-Mass.), at the same time tying her opponent to Romney — a preview of Democratic attacks if Romney is the nominee.


* Joe Coors Jr., younger brother of Coors beer empire chairman Pete, is running against Rep. Ed Perlmutter (D) for Colorado’s 7th district House seat. Pete Coors ran for Senate unsuccessfully in 2004 and apparently didn’t recommend it.

* Not a great sign: Rep. Silvestre Reyes (D) was outraised by a primary challenger in the fourth quarter of 2011. Former City Council member Beto O'Rourke raised over $221,354 while Reyes raied only $177,345.

* Arizona state Rep. Matt Heinz is the first Democrat to enter the race for former Rep. Gabrielle Giffords’ seat. He plans to run in both the August special election and the November election for the new 2nd district, a swing seat. Iraq war veteran Jesse Kelly (R), who ran against Giffords in 2010, is running again.

* A new poll from the Republican firm Public Opinion Strategies finds that only 33 percent of Utah voters think Sen. Orrin Hatch (R) deserves reelection; 58 percent want someone new. Hatch’s campaign, meanwhile, is asking supporters in an email to push back against online criticism of the senator.

* Manny Ortegy, the Law Chair of the Staten Island Democratic Party, has filed a Federal Elections Commission complaint against Rep. Michael Grimm (R-N.Y.) over allegations that the lawmaker accepted illegal envelopes of cash.


How to color.

With Rachel Weiner and Aaron Blake