Along the Rio Grande, Scenes of a Tense Border

Birther
A used-car dealer, Phil Wolf has erected a billboard in Wheat Ridge, Colorado, questioning President Obama's 'true' birthplace. He alleges that there has been a conspiracy to hide the 'truth' that President Obama was not born in America, and that he is an impostor. "Obama is a fraud and a fake," he says. "To me the guy is a radical Muslim. 100 years ago they would have hung this guy. In my mindset this guy needs to be done away with. You can't hold office in the United States if you are illegal. This guy is not an American."

• Arizona's Great Divide