The Dish's best resource is you. To wit: a reader with too much time on his hands dug into Politifact's massive data base of corrections and analysis. As he puts it,

What I’ve been doing the last couple days is manually transferring all the Politifact rulings from people here …that have “Republican” and “Democrat” next to their name, into a great big spreadsheet.

Of course, there's a big bold disclaimer: Politifact picks and chooses what topics it covers; it itself is not unblemished in its impartiality; none of this pretends to be a comprehensive, independent analysis of large swirling, now uncoordinated campaigns. Nonetheless, you can separate out party leaders on both sides, as selected by Politifact, and gauge their truthfulness, as measured by Politifact. Based on the following leaders – Romney, Boehner, Mitch McConnell, Gingrich, Perry, Santorum for the GOP and Obama, Biden, Reid, Pelosi, and  Clinton (Hillary) for the Dems, we get this graph:

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That's a lot of flaming trousers. Now for the media: Glenn Beck, Ann Coulter, Erick Erickson, Sean Hannity, Bill Kristol, Rush Limbaugh, Michelle Malkin, Grover Norquist, Bill O’Reilly, and Michael Savage for the GOP and Paul Begala, Donna Brazile, James Carville, Rachel Maddow, Bill Maher, Chris Matthews, Michael Moore, Lawrence O’Donnell, Keith Olbermann, Ed Shultz, and Cenk Uyger for the Dems. Hail the presence of Fox News at the far end of truthiness:

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One last graph, comparing Obama and Romney in the words that come out of their own mouths, as measured by Politifact:

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Again, what you see is a GOP advantage in truthiness in general but a huge discrepancy when it comes to total, massive, pants-on-fire whoppers. Romney, for some reason, seems attached to the Big Lie.