The large percentage of Republicans who think Obama wasn't born in the US doesn't really surprise me, considering that these same people don't believe in evolution or global warming. But, ignorance of evolution and succumbing to the millions of dollars of misinformation that comes from climate deniers is one thing. Refusing to believe the President was born in the US is, simply put, racist bullshit. No amount of ignorance could explain the seething hatred the birthers have for Obama.
Their hatred expresses itself through attempts to delegitimize him, to paint him a darker, more African shade of black. A recent poll showed that 46% of Republicans in Mississippi were opposed to mixed race marriages. President Obama is the child of a mixed race couple, so, right there, you've got half of Republicans who are openly racist. I'd be interested in seeing what percent of Iowa Republicans feel the same way.
I'm willing to bet that the percentage of Iowa Republicans who are against mixed race marriage is about the same as the percentage that thinks Obama wasn't born here.
In fact, I'm willing to bet that those percentages are the same for Republicans everywhere. Because they are, as a group, about half racist assholes, and the other half just pure assholes.
"A whopping 48 percent of Iowa Republicans said they don’t believe that Obama was born in the United States, according to the automated survey by Democratic firm Public Policy Polling out Tuesday. Another 26 percent said they weren’t sure whether or not the president was born in America as the Constitution requires to be eligible to serve in the nation’s highest office."
- Poll: Half of Iowa Republicans don't believe Barack Obama was born in U.S. - Juana Summers - POLITICO.com (view on Google Sidewiki)