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Seeking to put "Bittergate" behind him, Barack Obama released a new TV ad in Pennsylvania on Tuesday suggesting that rival Hillary Rodham Clinton's response to his recent gaffe has been excessive, and that it is part of an old style of politics that voters are rejecting this primary season.

Clinton has indeed mentioned the "bitter" comment on the trail every day this week, and she released what many consider to be the first true attack ad of the Democratic race on Tuesday, featuring Pennsylvanians reacting negatively to the Illinois senator's remarks. Obama said Tuesday that the New York senator's reaction is one of desperation: "This is what we do politically, when we start getting behind in races. We start going on the attack." But with his response ad, Obama hopes to turn the tables on Clinton.

"Represent" (subscription) shows footage of a crowd booing Clinton when she said at an event in Pittsburgh on Monday that she was "disappointed" by Obama's remarks. "There's a reason people are rejecting Hillary Clinton's attacks -- because the same old Washington politics won't lower the price of gas or help our struggling economy," an announcer declares.

The ad goes on to tout endorsements Obama has received from Pennsylvania newspapers -- the Scranton Times-Tribune and the Morning Call of Allentown -- in the last several days, despite the "Bittergate" uproar. And it shows footage of Obama speaking in Steelton, Pa., encouraging voters to "get past the politics of division and distraction" and "start focusing on what we actually have in common."

Despite the implications of Clinton's ad, meanwhile, new poll numbers suggest that Obama's gaffe has not hurt his standing among voters nationally or in Pennsylvania [PDF].