Personally, I don't think anyone should vote on just one issue. There are much more important things going on in the world then whether or not you can gamble freely. How you think the future President of the United States will handle the war in Iraq, or the economy, or education for instance, is more important. They are bigger issues. That being said, I still like Ron Paul.
This is a poker blog, I'll stay on subject. Ron Paul was a big supporter of the Poker Player's Alliance as a Texas congressman, and the only of the presidential candidates to personally meet with many poker pros in support of their cause. This means more to me than just that Paul supports poker, he supports of our freedoms in general. If you are unsure of Ron Paul, the next best bet for the cause is a democrat. Any of them, but in particular Obama or Richardson. I really like Richardson because I feel he has the best aspects of Obama and McCain and few of their faults. To read more about the candidate's position on internet gaming refer to The Presidential Candidate Scorecard.
Since Richardson and Paul will probably miss their party's presidential bid, I will probably have to settle for Obama (my third choice, not bad.) For now, the primary's are the time to vote for who you really believe in, so get out their and vote.