Funny that almost all of the candidates from 2010 and this year disagree with you and credit Governor Sarah Palin with significantly boosting their campaigns, if not being the decisive factor. Google it.
People think that negative adds depress turnout, despite all evidence to the contrary.
And until last week, a lot of people believed that high turnout in the TX run-off meant David Dewhurst would win.
What people believe doesn't concern me as much as what the evidence shows really happened. And there's no evidence that an endorsement (from anyone) was a decisive factor in the TX primary.