McConaughey, a household name from such movies as “Dazed and Confused” and “Dallas Buyers Club,” is not a political figure, but he flirted last year with running for governor of Texas, finally announcing in November that he had decided against it. “As a simple kid born in the little town of Uvalde, Texas, it never occurred to me that I would one day be considered for political leadership,” McConaughey said in a video at the time, adding that he would seek other ways to make a difference.