Roll Call lists the top ten most vulnerable House members up for re-election this year — six Republicans and four Democrats.

“He’s not overwhelming, that’s the problem through the whole damn
primary. What’s the spark? What’s the thing that gets him off and
running? No one knows.”

— Former House GOP leader Bob Michel (R-IL), quoted by Politico, on Mitt Romney.

“This is all about getting delegates. If the polls are right, we’ll pick up some delegates. That’s what it’s all about.”

— Mitt Romney, quoted by ABC News ahead of the Alabama and Mississippi primaries last week.

“I know a lot of people will talk about delegates and strategies and math and that’s all very interesting to the insiders. But I think the American people want to see someone who has the leadership, skill and experience to defeat the president, and a vision of conservatism that will get American back on track again.”

— Romney, in an interview yesterday on Fox News Sunday.

A new Global Strategies Group poll in Indiana finds Sen. Dick Lugar (R-IN) leads his GOP primary rival Richard Mourdock (R) by just six points, 45% to 39%.

In what First Read calls “another gut punch” for Mitt Romney, former Mississippi Gov. Haley Barbour (R) told ABC News that he voted for Newt Gingrich last week in his state’s GOP primary.

Said Barbour: “I didn’t endorse anybody. I didn’t want to try to influence anybody’s vote, so beforehand I didn’t say who I voted for. But Newt and I have been friends a long, long time… Out of friendship, I voted for Newt.”

A new Washington Post-ABC News poll finds two-thirds of Americans say the U.S. Supreme Court should throw out either the “individual mandate” in the federal health care law or the law in its entirety — signaling the depth of public disagreement with that controversial element of health care reform.

The Supreme Court opens hearings on the law’s constitutionality next week.

Meanwhile, BuzzFeed notes President Obama’s re-election campaign “has launched an all-out defense of his landmark, and unpopular, health care overhaul, a move that marks a realization: The issue can’t be avoided.”

“This is someone who doesn’t have a core. He’s been on both sides of almost every single issue in the past 10 years.”

— Rick Santorum, on CBS’s This Morning, about Mitt Romney.

A new Public Policy Polling survey in Illinois finds Mitt Romney comfortably ahead of Rick Santorum in the GOP primary, 45% to 30%, followed by Newt Gingrich at 12% and Ron Paul at 10%.

A new American Research Group poll shows Romney leading with 44%, followed by Santorum at 30%, Gingrich at 13%, and Paul at 8%.

A new Fairleigh Dickinson University poll in New Jersey finds Sen. Robert Menendez (D-NJ) ahead by double digits over Joe Kyrillos (R) in the U.S. Senate race, 43% to 33%.

Mitt Romney will win the Puerto Rico GOP primary, CNN projects.

Early results show it was a blowout. It looks like a possible strategic blunder for Rick Santorum for trying to compete there.

“For the first time in a generation, Republicans are preparing for the possibility that their presidential nomination could be decided at their national convention rather than on the campaign trail, a prospect that would upend one of the rituals of modern politics,” the New York Times reports.

“The race remains Mitt Romney’s to lose, and if he continues to accumulate delegates at a steady clip… he can still amass the 1,144 necessary to secure the nomination before the last primary, in Utah on June 26. But as he struggles to win the hearts of conservative voters and hold off a challenge from Rick Santorum, party leaders, activists and the campaigns are for the first time taking seriously the possibility that neither he nor anyone else will get to that total.”

The Washington Post notes President Obama trails Republican front-runner Mitt Romney “in finding donors willing to give $2,000 or more — a surprising development for a sitting president, and one that could signal more worrisome financial problems heading into the general election. At this point in the last election cycle, Obama had received such large donations from more than 23,000 supporters, nearly double the 11,000 who have given him that much this time. President George W. Bush had more than four times the number of big donations at this point in his reelection.”

“Republicans and Democrats alike thought that Obama would have a big financial advantage over Republicans this fall given his record-breaking 2008 fundraising and his status as the sitting president. But the trend of slackening big-donor support is the latest in a series of indications that the 2012 money battle is going to be much tighter than once imagined.”

“A contested convention isn’t necessarily all bad.”

— Former Mississippi Gov. Haley Barbour, in an interview on This Week, on a deadlocked Republican convention.

Brad Phillips: “By accepting Maher’s donation, top Obama officials are now forced to spend valuable time parsing the differences between the appropriate and inappropriate uses of misogynistic language, having to explain to voters why calling Sarah Palin a ‘c*nt’ is different than calling Sandra Fluke a ‘slut.’ As a result, the Obama Administration – and more broadly, the Democratic Party – is ceding the moral high ground it temporarily claimed after Limbaugh made his incendiary comments.”

“Top Obama officials are trying to dismiss Mahers’ comments as somehow different than Limbaugh’s. And I agree with their assertion that comedians should have more license to push the rhetorical envelope than others in public life. But the standards of politics, not stand-up comedy, started to apply the moment the President’s SuperPAC accepted Maher’s high-profile, seven-figure gift.”

“It’s gone way too long and gotten way, way too personal.”

— Sen. John McCain (R-AZ), in an interview on Meet the Press, describing the Republican presidential primary as “the nastiest I’ve ever seen.”