Is voting democratic a sin?

Bishop gives Communion Warning to Voters

First off, this Bishop is waaaaaaaaaay out of line in my opinion.

Secondly, personally I believe that what you vote is between you and your conscience. There's no way in hell that I'm voting for Bush this year. I support stem cell research, I believe that abortion should only be allowed in situations where the mother's life is in danger and that partial birth abortion is evil and a sin. I also believe that if 2 people love each other than they should be given the rights of a couple, regardless of gender. So what does that make me? The person that's going to vote for the person that's going to screw her over the least.