Barr files to have both Obama & McCain removed from ballots in Texas due to missing deadlines:
http://www.bobbarr2008.com/press/press-releases/133/bob-barr-files-suit-in-texas-to-remove-mccain-obama-from-ballot/
Course while it might work, honestly I expect they would just hand-write in their candidate anyway (shrug) It would be funny if Texas had to go 3rd party & just couldn't vote Republican (or Democratic/not that they would) - lol.