The question is: Why do we allow them to force us into calling them gays? They are homosexuals.
As I think Father Neuhaus has pointed out, "homosexual" is a clinical term for their condition. "Gay" is essentially a political term. So, homosexual is what they are, but "gay" refers to their political agenda and beliefs.
So, Foley is a homosexual insofar as he prefers sex with males, but he is gay insofar as he follows the gay rights political movement. I didn't really know anything about Foley before this story broke, but I gather that he adheres to the gay political agenda on matters such as abortion, another reason why it's just as well he is no longer in congress.