The chances of your vote being the one to change the outcome of a large election are extremely small, so it doesn’t really matter that much what you do with your ballot. However, if you have the means to influence other people’s votes, that might count for something. Therefore, I think it’s good to discourage people from voting for the apparent lesser of two evils. If you vote, try to vote as best as you can for your class interests. (Chances are that you belong to the working class.) Don’t feel bad about abstaining if the candidates to choose from represent class interests that are counter to yours to the extent that you can barely tell them apart.