Blaming the voters you aim to woo is a losers tactic.
Just like Obama avoiding Fox News...another loser's tactic.
Using another example, I never "blamed" Perotistas for Bush 41 losing to Clinton. Sure, they had an effect, but the real reason Bush lost was he ran a terrible campaign.
A more recent example are the RINOs and Dems that say Palin lost it for McCain. The only reason why I voted for McCain was because of Sarah. Her crowds outdrew McCain's by a factor of 2:1 if not more.