The man there told me I could not. I didn't question him, though, as I wasn't that serious about it. I've never voted for a dem that I can remember. (I did vote for George Wallace once when I was young and stupid--I thought that Goldwater guy sounded strange--LOL! I sure wasn't paying much attention in those days.)
Whatever--thanks for the skinny--I'll remember that from now on.
Try this link: http://tlo2.tlc.state.tx.us/statutes/el.toc.htm
It is to the Texas Election Code. Read Chapter 162. So long as you state that you are a Democrat (the hard part), and have not affiliated with another political party this election cycle, they have to let you vote.
Don't lie -- that is a crime, and your vote is void.