If you are still opposed to the Iraq and Afghanistan wars, then please consider voting for Ron Paul in the 2012 Republican primaries. With Ron Paul as the Republican nominee, we would have the best chance of actually stopping these wars. Any other Republican nominee is going to continue the wars indefinitely and even start a new one in Iran.
Even though Ron Paul is a Republican, he has voted against the wars consistently over the past decade. He is not afraid to go against the rest of his party in order to do what he feels is right. I think this is what we need right now.
If your state has a closed primary, this means you must be registered as a Republican in order to be allowed to vote in the primaries. Therefore, in order to make Ron Paul the Republican Presidential nominee, we need people like you to vote in your state's Republican primary. After this, you can switch back to your former party if you choose. I personally have switched for the sole purpose of voting for Ron Paul and will switch back again.