I've given up on Palin [link fixed]

Palin’s campaign antics can be forgiven. What can’t be forgiven is the ham-handed way she’s tried to build her national profile since she returned to Alaska. She’s abandoned the bold right-left populism that won over Alaska voters—and me—in the first place in favor of an increasingly defensive and harsh partisanship. After making her name as a determined enemy of Alaska’s corrupt Republican establishment, she recently called for Democratic Sen. Mark Begich to step down so the hilariously crooked Ted Stevens could get another crack at the seat. She loudly promised to leave federal stimulus money on the table before clawing that promise back with a whimper. One can’t help but get the impression that Palin is a clownish, vindictive amateur…

What I’m wondering is: has Sarah Palin undergone some kind of secret lobotomy?