The chance that Alaska Gov. Sarah Palin won't be the Republican veep nominee is 15 percent and rising, according to the political prediction market Intrade.

The stock had traded at 3 percent at the start of Tuesday. The movement comes amid news of the pregnancy of Palin's teenage daughter and questions over how thoroughly John McCainJohn Sidney McCainAmerica's newest comedy troupe: House GOP Michelle Malkin knocks Cokie Roberts shortly after her death: 'One of the first guilty culprits of fake news' Arizona Democratic Party will hold vote to censure Sinema MORE's campaign vetted her before announcing her as the veep pick last week.