Pay close attention to Joe Biden's words tonight. During an appearance on this morning's "Morning Joe" Bill Adair, Washington bureau chief for the St. Petersburg Times and editor of politifact.com, implied that Barack Obama's running mate is not always truthful. Adair told hosts Joe Scarborough and Mika Brzezinski that "from a fact-checker's standpoint, we should be grateful to Joe Biden" because he is "full employment for fact checkers."

Brzezinski asked Adair about "the most outrageous statement" by Biden and Adair pointed to Biden's soundbite in which he says John McCain votes with George W. Bush 95 percent of the time. He discredited it, along with a charge from Hillary Clinton's speech last night about John McCain desire to privatize social security, "I thought, well, in terms of Biden, the 95% is just something where you've got to understand that that's sort of the worse case scenario. He's cherry picking. 95% was last year. Last night one of the things that Senator Clinton said that we'll hear a lot is John McCain wants to privatize social security. We heard it from several of the other speakers last night. You know, that's a real exaggeration. McCain is actually really vague and fuzzy on social security."

Biden's "95 percent of the time" charge may be the "worst-case scenario" but the fact remains that people should pay close attention to what Biden says tonight.