Nyhan compares her favorables to Clinton's:
Though Clinton started 2007 as a less polarizing figure than Palin, the public quickly reverted to being sharply divided about her as she began to campaign actively for the Democratic nomination. Assuming Palin's remaining supporters will stick by her, she may end up with a similar profile in April 2011 as Hillary had in April 2007. In that case, a successful nomination campaign is plausible (and even a general election victory if the economy is in bad enough shape). However, her failure to improve her image during this pre-primary period may cost her the elite support she needs to win the GOP nomination.
What Republican elites?