Gail Collin's of the NY Times thinks that Joe Biden now has the throw away line of the year "I know Hillary Clinton. Hillary Clinton is a friend of mine, and governor, you’re no Hillary Clinton". The problem for Biden is that Palen may well respond to that line, with something like "You're right, Senator. I've held real jobs, didn't carpetbag my way to a Senate seat, and never made $100,000 in one day of trading."
Liberals are afraid because, as they know, Joe Biden is a gaffe machine. He might have been able to get away with a cheap shot at Mitt Romney's religion, or hair, or whatever. But if he produces another 'Indian's at 7-11' shot towards Palin he may find himself on the bitter end of 150 million scorned female tongues.
Liberals are bothered because McCain could already run on a platform of being bipartisan, and reform minded, and has legislative accomplishments to back it up. Obama can talk about change, but has no legislative record to show that's what he is about. Palin brings that reform spirit, a record to prove it, and an outside the beltway presence that Joe Biden can't fake, or plagiarise.
The Democrats are making a big deal of her lack of foreign policy experience, which is valid, and claim it negates any claim that Obama is too inexperienced. The problem with that is Obama is the guy in the decision making seat on their side of the fence, Palin isn't. Biden's "experience" consists of chairing a committee that doesn't make policy, it second guesses it for the most part.
The other side of that coin is Palin holds executive experience that none of the other 3 have. No, it's not a great deal of it, but it's more executive decision making experience than her counterpart, who's been holed up in the Senate for 35 years.
Palin's also done something that neither Obama or Biden has, she's stood up to the party big wigs. Senator Frank Murkowski put her on the Oil and Gas Conservation Commission, and she promptly started an ethics investigation into the state's GOP chair. She also took on the GOP's Attorney General in the state, who ended up resigning.
Say "Ethic investigation" around Obama and he suddenly knows nothing about anything and never met anyone. If you say ethics around Biden he says the plagarism wasn't his fault.
Palin may not be the person most of us were thinking of as a running mate, but she may well prove to be a good one.