Why are House Speaker John Boehner, R-Ohio, and other GOP leaders so reluctant to distance themselves from those who think President Obama isn't a citizen? Because "birthers" are now a majority of likely GOP primary voters. According to a new survey by Public Policy Polling, 51 percent of likely Republican primary voters either think that Obama was born outside the United States or are unsure. Also of note, Sarah Palin has an 83 percent favorability rating among birthers. Among GOP non-birthers, her rating is 47 percent. Meanwhile, Palin said last weekend that it was unwise for Republicans to keep doubts alive about whether Obama is a U.S. citizen. "It's distracting. It gets annoying," she said. "Let's stick with what really matters."