GOP 2012 Favorables/Unfavorables

Nate Silver:

It does look like Republicans have some legitimate reason to worry. In the previous five competitive primaries — excluding 2004 for the Republicans, when Mr. Bush won re-nomination uncontested — each party had at least two candidates whose net favorability ratings were in the positive double digits, meaning that their favorables bettered their unfavorables by at least 10 points. All five times, also, the nominee came from among one of the candidates in this group. Republicans have no such candidates at this point in time.