Rebelling against the lesser of two evils vote

There's a discussion going on at Mark Sheas discussion on the personal culpability and objective evils of voting for anybody in this election.

Okay: same with all moral decision-making, including politics. I think it is an objective evil to support a candidate who wishes to use his office to commit gravely immoral acts such as sign the Freedom of Choice Act or support stem cell research. I make no distinction between candidates who want to cannibalize babies who are big and candidates who want to cannibalize babies who are small. I think anybody voting for either candidate is committing an objective evil.

So, with this hypothesis if Pol Pot, Fidel Castro, Saddam Hussein, Adolph Hitler were running against a John McCain or even Obama and were leading in the polls - responsible people who lobby to make sure Pol Pot doesn't win are committing an objective evil?

Not withstanding that fact that this allegation contradicts the the Pope's guidance, the idea that we should do nothing in the face of an Obama administration - is like standing by and doing nothing while a drunk driver gets behind the wheel of a car in our presence because he is a proabort.

Do check out the comments