The double standard.

James Taranto:

Imagine if Republican activists had gotten wind of Jim McGreevey's homosexuality before he announced it, and had threatened to "out" him in order to hurt Democrats. One suspects the likes of [Mike] Rogers would have viewed such Republicans as antigay bigots, or at least as panderers to bigotry. But how is what Rogers was proposing to do--expose a gay member of the opposite party in order to hurt that party--any different? (There is nothing in Rogers's blog entry to suggest he was aware of Foley's penchant for congressional pages or anyone who actually was underage.)

Rogers would presumably say that Foley was fair game because he supported policies Rogers thinks are antigay, such as the Defense of Marriage Act. In other words, antigay means are acceptable in the pursuit of pro-gay ends. This is a paradox of identity politics: Politics very often ends up trumping identity.

Certainly on the left it does.

It's fine with Democrats if you're gay, but if you're also a Republican, you'll be mau-maued, as will all your friends.