For the first time in years, many analysts consider Texas a "make it or break it state" for the democratic nomination.
Senator Clinton is already cutting checks for local air time.
Democrats say with the race so close, everyone needs to vote.
"I think we have seen, with commentators and pundits making historic prediction after historic prediction, that no body knows in this election ,and that's why people need to vote," said Lubbock Democrat Robin Parks.
The Texas Primary is on March 4.