Except votes and probably money, both of which help win elections.
Our Log Cabin "Republicans" in Illinois supported Kerry over Bush, Obama over Keyes, and Bobby "black panther" Rush over Wardingley.
Why? Because none of their "fellow" Republicans on the ballot supported special rights for gays.
I don't care what they call themselves, the Log Cabin crowd exists only to inflitrate the GOP and get it to support the RAT agenda. They are NOT Republicans, just a Democrat front group. The only "Republicans" they endorse are RINOs who promise to vote for the radical gay agenda. A REAL Republican group endorses the candidate closest to their own views in the primary, and then backs whoever the party nominee is in the general election.
If they were a group of conservative-minded gays whose motive was to get other liked-minded pro-life, pro-gun, lower-tax, less-spending, anti-amnesty, pro-WOT people who HAPPEN to be gay -- to pull the lever for Republicans, I'd be fine with that.
That is not their motive. Their motive is simply to make the GOP socially liberal and pro gay-marriage. And that is the ONLY issue that will get them to endorse "Republicans".
In short, they are the Log Cabin Democrats and ought to advertise themselves as such.