Palin won't run for President because there's an the off-chance she might get it and thus be saddled with responsibility and accountability, both of which she avoids like the plague.
Fascinating that the Republican Leadership Conference group hired an Obama impersonator for entertainment and laughed like crazy at the racially-specific Obama jokes, but walked the man off-stage when he began jibing at Newt Gingrich and Michelle Bachmann. Guess blackface comedians aren't funny unless they're making fun of one of their own.
Perry's nomination aspirations are based on good hair and how well he has supposedly governed Texas. The hair wins.