It really bugs me when politicians show up at churches right before elections. I hate the feeling that a house of worship is being used to make candidates look good. ("I'm a Christian! Vote for me!")
Unfortunately, at least one member of my church is very active in politics, so we have political candidates show up on a fairly regular basis ("fairly regular basis" meaning "before each election").
Part of me, though, is excited to see politicians in church--I suspect that many, perhaps most, of the visiting politicians are unsaved. What an opportunity to present the Gospel to them--and they're basically just showing up and asking for it. (Of course, who knows whether any of them are actually listening? I pray that they are...)