You know, this happens every election year though. Instead of avoiding it I think the better way to handle it would be to actually setup threads for each candidate. Hear me out. Have one for Hillary, Obama, Edwards, Kucinich, Gravel, Romney, McCain, Huckabee, Thompson, Paul, and Hunter. Each thread would be where ONLY that candidates supporters would go to talk.
For instance, the "hidden" Ron Paul thread has been civil, polite and a nice discussion, then throw in someone like Juno who clearly doesn't like Paul and wants to be snarky and it starts to fall apart.
Religion, politics, and money are always problems, but while religion can be pretty well avoided, and money only comes up with someone rips someone off, the other is more passionate and shows up all the time since it affects so many.
Then as these threads go, people can read them if they want to but if they don't agree they don't post or the post gets deleted. Once a candidate drops out, the thread gets deleted.
Just a thought since there is nearly a year to go and with a few thousand members the RPF is a place that talks about everything, politics really can't be totally avoided.