“And don’t ever forget, Barack Obama is a great uniter of Republicans.”

— Former Mississippi Gov. Haley Barbour (R), in an interview on Bloomberg TV.

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Louisiana Republicans head to the polls today to make their choice for Republican presidential nominee. Nearly every public opinion survey shows Rick Santorum holding a solid lead over Mitt Romney.

Polls close at 9 pm ET.

A new Rasmussen survey in Wisconsin finds Mitt Romney with a double-digit lead over Rick Santorum in the Republican presidential primary, 46% to 33%, followed by Ron Paul at 8% and Newt Gingrich at 7%.

The Wisconsin primary is on April 3.

Rep. Shelley Berkley (D-NV) faces an ethics investigation in the midst of her bid for U.S. Senate this year, as she hopes to knock off incumbent Sen. Dean Heller (R-NV), National Journal reports.

It is not clear what the subject of the probe is but Politico hints it’s “over allegations that she used her official position to aid her husband’s business.”

Rep. Richard Hanna (R-NY) was the only Republican congressman at an Equal Rights Amendment rally yesterday and he advised a crowd of mostly women to give their money to Democrats, the Huffington Post reports.

Said Hanna: “I think these are very precarious times for women, it seems. So many of your rights are under assault. I’ll tell you this: Contribute your money to people who speak out on your behalf, because the other side — my side — has a lot of it. And you need to send your own message. You need to remind people that you vote, you matter, and that they can’t succeed without your help.”

Michael Hirsch: “It would be a cruel irony indeed for Mitt Romney, whose father’s political career was ended with one indelible word — ‘brainwashed’ — if the son suffered the same fate at the hands of one of his most loyal aides, Eric Fehrnstrom. But if the Obama campaign were smart, right now it would be using some of its millions of dollars to hire the best former Saturday Night Live writers out there, all in an effort to keep the country laughing at the image of Mitt Romney as ‘the Etch A Sketch candidate.'”

Capitol Hill sources tell Howey Politics Indiana that Club for Growth is planning to spend $1.8 million on behalf of Richard Mourdock (R) in his GOP primary challenge to Sen. Dick Lugar (R-IN).

A new Pew Research poll looks at “quick, off-the-cuff public impressions” of the GOP presidential candidates.

For Mitt Romney, the overall number of people citing money or wealth has soared since late last year, with mentions of his religion way down. His top five in the new poll are “no,” “rich,” “good,” “Mormon” and “moderate.”

The top five for Rick Santorum: “conservative,” “no,” “good,” “OK,” and “crazy.”

For Newt Gingrich: “old,” “no,” “idiot,” “untrustworthy” and “dislike.”

“There is a keen awareness in the party, particularly among fund raisers and elected officials, that Santorum is playing to hurt Romney so that Romney loses. Santorum sees himself as the nominee in 2016, and he’s playing a 2016 game. You wouldn’t continue to rip at Romney and tear at Romney and try to damage Romney if you were playing the normal, second-place game. The normal second-place approach is to rally around the nominee and become part of the leadership of the party.”

— Romney fundraiser Wayne Berman, quoted by Mike Allen.