Houston could be largest U.S. city to elect openly gay mayor on Tuesday.
A Lake Research poll released this week showed Annise Parker in the lead with 27 percent of the vote.
Parker, the current city controller, is known for her low-key manner, and if the polls are indicative of Tuesday vote, she could become the first openly gay woman to be elected mayor of a major American metropolis.
Her opponents, Peter Brown, had 21 percent and Gene Locke had 17 percent. The undecided voters, at 24 percent, could determine the election.
Parker has been with her partner for almost 20 years, and they have two adopted children.