After swapping leads early in the Democratic gubernatorial runoff, Valdez pulled ahead of White and will face incumbent Gov. Greg Abbott.
Monday marks the start of a five-day period of early voting for the May 22 primary runoffs, including statewide and local races.
The two Democratic candidates for governor sounded out their differences Friday evening in their first and likely only debate before the May 22 runoff.
Democratic voters will have nine candidates to choose from for governor on the March 6 primary ballot.