I know that sounds a little crazy, but basically what I'm saying is that you make it so that you can go to the website and choose a category, but then the actual individual talks are linked dynamically so there's no way to send out a "Vote for this <link>" tweet.  Instead you'd have to say, "Please vote for 'My talk' in the 'My track' category at <main link>" and I think few people are going to do that.

Just a thought.