Via Think Progress, here's Florida Rep. Cliff Stearns debating whether Obama's much-vetted birth certificate is "legitimate" in a recent meeting with constituents:
I would expect it of the Republican base. Let's face it, if you're still in the Republican "base" after the Bush years, you're either a dim bulb, not paying any attention, or have certain issues that force you into being Republican no matter how badly they screw up. Having so many high-profile Republicans pander to that, though—that's what's new about the party. Believing in conspiracy theories has become a litmus test for office. You have to believe certain sciences are a "hoax," and that reforming national health insurance options equals "death panels," and that the president isn't a true Christian because, um, because he spent kindergarden in another country and was thus indoctrinated into their evil ways or something to that effect, and so on. Like I said, conspiracy theories.
As reminder, Stearns is the one leading the House GOP's "investigation" into Planned Parenthood, the one that the Komen foundation used as cover for ending funding to Planned Parenthood for breast cancer screenings. So he's no stranger to the idea of "investigating" things as purely political endeavor.