Obama has 8 years experience in state government, 4 in federal.
Clinton has 6 years experience in federal government, far more only if you count first lady (but arguably, her biggest accomplishment on that front was delaying advances in healthcare for over a decade - doh!)
Edwards has 6 years experience in federal government
You've got to get to the 2nd tier candidates to find vast experience.
Of course, experience is the enemy on the Republican side as well. I'm sure that the relative success of Huckabee and Romney has a lot to do with the fact that they've not been in the federal eye a lot, while the likes of McCain have. Giuliani is "special" in this regard... if not for 9/11, his legacy would be as a mediocre mayor.
Note that Romney wasn't "the main man" in Massachusetts the way a lot of governors normally are in their states. Massachusetts has a Democratic supermajority in their legislature, and can readily override any gubernatorial veto. That's one big reason you don't see him run on his record there.
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