That's the problem, 55% solid, 25% maybe and 20% no chance equals a loss.
The USA Today poll is just about the primary. The poll does NOT suggest that the disaffected 20% is really going to vote for Hillary, as it were, in the General. That question was not asked. It was about the primary. Polls show Rudy even or beating the Dems in the General, in a very negative environment right now. Romney is getting slaughtered at the moment in General Election matchups, and McCain is slowly sinking, as he loses his moderate swing voter attraction over various matters.