What are "The Birthers?"

The party who loss the last presidential election can't seem to gain any traction attacking President Obama's politics, so they are aiming at his credibility. Where was he born? Is he a real US citizen?

Harry Shearer: Why The Birthers?: "Enter Barack Obama. One could be satisfied with opposing him on issues, as I do on the lunacy of the Afghanistan venture (al Qaeda has long since moved its leaders to Pakistan and its recruiting to Somalia) and the vacancy of his response to the continuing federal betrayal of New Orleans. But events show you can't turn out livid opponents to town hall meetings on those policy grounds. You can generate mouth-foamers, however, with the question of his nation of birth. Republicans, dependent on consultants to advise them on the exquisite variety of methods of nay-saying, gaze longingly at the emotional power of a charge of illegitimacy. The birthers are their wind turbines."

Ah...the Palenists....