Sorry, BC, but Palin is a Teabagger spokesmodel and does not have the support of the real GOP power. At this point, all she's got is name recognition and intense support from a very loud, shrill base.
Besides, nothing will GOTV for libs, progressives and moderates everywhere quite like her name on the ballot. And, much though she may try, she will not be able to communicate solely through FNC, FB and Twitter and the glare of a full national press (of all persuasions) will wilt her and expose her every flaw once people start paying attention.
Honestly, right now we have no idea what the sausage-making caucuses and primaries will bring this far back, but at some point she'll be bought out and sidelined by the same crowd who selected Dole over, say, Kemp. The GOP is all about seniority and pecking order: they are intensely hierarchical, and it's simply not yet her turn.
IF GW Bush had been born with any other name, his empty suit would never have been given any consideration. The guy with the biggest cry-towel this cycle is Jeb. He's got an ideal resume and a wonky head for policy details, plus he's got real cred with Latinos (wife, kids, speaks Spanish) and, at least by 2012 standards, is seen as moderate on social issues. But the electorate simply will not forgive him his last name.
I cannot imagine Romney being acceptable, having brought mandated health care reform to MA, Mormonism aside (those are two insurmountable blows, IMO). Huckabee actually has a shot, he has his place in line after impressive showings in 2008, but I just don't see him either. He's excessively pious, fiscally non-conservative and so very regional. He also has a "Willy Horton" problem involving a parolee who wound up killing two cops.
That leaves a second-tier of benchwarmers with no name recognition and little or no place in the pecking order. We'll have a lot to live through, domestically and internationally between now and voting day 2012. Fucking up Afghanistan or Iraq (beyond the disasters they already are), troubles with Iran, Russia or N Korea are certainly not impossible, and economic realignments in the EU might end up impacting us in ways we cannot predict now.
But excluding another massive terror attack or another implosion in our domestic economy, I truly believe there's no one with the experience, charisma and electability to unseat a sitting president.