It's going to a long campaign. As Paul Krugman indicates, though he's discussing Romney's stump speech:
Now, however, Mitt Romney seems determined to rehabilitate Bush’s reputation, by running a campaign so dishonest that it makes Bush look like a model of truth-telling.
I mean, is there anything at all in Romney’s stump speech that’s true? It’s all based on attacking Obama for apologizing for America, which he didn’t, on making deep cuts in defense, which he also didn’t, and on being a radical redistributionist who wants equality of outcomes, which he isn’t. When the issue turns to jobs, Romney makes false assertions both about Obama’s record and about his own. I can’t find a single true assertion anywhere.
And he keeps finding new frontiers of falsehood.