A tie in Pennsylvania, a double-digit lead for Obama, an Etch-a-Sketch jab from Elizabeth Warren and a “humorous” story from Mitt Romney.

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WHAT YOU MIGHT HAVE MISSED:

* A new Franklin & Marshall poll shows former Pennsylvania senator Rick Santorum’s lead over former Massachusetts governor Mitt Romney among likely GOP voters in Pennsylvania has shrunk to a statistically insignificant 30 percent to 28 percent. In February, Santorum led Romney in his former home state 45 percent to 16 percent. But four in five voters are still undecided.

* A new CNN poll finds President Obama has a double-digit lead over former Romney, 54 percent to 43 percent. Obama’s approval rating also inched above 50 percent in the same survey. Yet more good news for the president, on the same day that a Quinnipiac poll showed him leading in key swing states.

* Vice President Joe Biden stepped up his attacks on Romney at a speech in Iowa today, calling the GOP candidate “consistently wrong” on American manufacturing. Liberals are also attacking Romney for telling a “humorous” anecdote today about his father closing a car factory in Michigan and moving all the production to Wisconsin.

* Romney went to bat for Wisconsin Gov. Scott Walker (R) today, telling voters at a tele-townhall that the embattled Republican is “an excellent governor” who was right to try to “rein in the excesses” of public worker unions. Walker faces a recall election over his collective bargaining legislation. Santorum has also pledged to help Walker out.

WHAT YOU SHOULDN’T MISS:

* A new web ad from Massachusetts Senate candidate Elizabeth Warren (D) features video of the Harvard Law Professor telling a crowd, “What the lobbyists want, what Wall Street wants, is they want Etch A Sketch Senators.” Eric Fehrnstrom, the Romney aide who made the “Etch-a-Sketch” gaffe, is also an adviser to Sen. Scott Brown (R-Mass.).

* It’s not quite the stuff of brokered conventions. But a Tennessee attorney named John Wolfe Jr. might actually take at least three delegates away from Obama at the Democratic convention after taking nearly 12 percent of the Louisiana primary vote. He’s looking ahead to the Arkansas primary as another chance to pick up support.

* Rep. Jason Altmire (D-Pa.) is out with a new ad attacking fellow Democratic Rep. Mark Critz in their bitter member-vs.-member race for a conservative-leaning new seat in Western Pennsylvania. “Mark Critz and I agree on many things, but there are a lot of differences between us,” Altmire says, claiming Critz voted against Wall Streeet reform and failed to vote against the budget proposed by Rep. Paul Ryan (R-Wis.) (Critz voted “present” on the Ryan budget as part of a procedural maneuver orchestrated by House Democratic leadership. He voted against it at another point.) Meanwhile, Rep. Robert Brady (D) is the first member of Pennsylvania’s Democratic delegation to take a side in the race, donating to Critz.

* Sen. Marco Rubio (R-Fla.) has yet again claimed that he’s ‘not going to be the vice presidential nominee,” telling MSNBC that there are “a few things I'd like to get done here first in the Senate.”

THE FIX MIX:

Apropos of nothing.

With Rachel Weiner