What stands out from this chart is:
Joe Lieberman said NOTHING.
Bill Clinton strayed from the foreign policy message the Obama camp had wanted -- but was rendered a non-issue considering his full-throated endorsement of the Democratic nominee.
Sarah Palin attacked the Dems less often (or perhaps less overtly) than my initial, real-time impression. Does this means her vindictiveness was subtle and snarky? If so, this is a trecherous path for a new candidate (at the risk of being called a sexist, it's especially perilous for a female) to tread.
Moreover, the Republicans simply echoed the call for change. Since anyone with half a brain has known since the 2006 midterms this would be a change election, it seems they're playing a desperate game of catch-up.