Same-sex attraction is not a choice, but homosexual conduct and homosexual self-identification are choices. Pawlenty ignored the silly "choice" question and answered the more relevant one--what causes homosexuality?--accurately. He went on to say, "There's no scientific conclusion that [homosexuality is] genetic." PolitiFact rated this statement "mostly true"--but grudgingly.
Most of their "analysis" was devoted to explaining that if Pawlenty had said it's not "biological" (rather than "genetic") it would have been false. They quote the American Psychological Association's research on "possible genetic, hormonal, developmental, social and cultural influences" and concede, "no findings . . . permit scientists to conclude that sexual orientation . . . is determined by any particular factor." Pawlenty is right. And PolitiFact's contradictory conclusion that "scientists do believe that sexual orientation is caused by biology" is wrong.