Wall Street Journal/NBC: Palin approval at -28%

Sarah Palin's favorable rating continues to drop, in a new WSJ/NBC poll.

Only 25% view her positively, while 53% view her negatively. Newt Gingrich also sports a rough rating at 24%/37% for -13%.

On the other hand, their possible opponent -- Barack Obama -- has a comfortable +14% favorable rating.

That only translates to a 43%/38% lead over a generic Republican in a 2012 contest, showing he's vulnerable.