Ann Wagner of Ballwin is seeking a third term as District 2 representative in the U.S. House of Representatives.
To do so, she’ll have to defeat a Republican challenger in the Aug. 2 primary election, Greg Sears of St. Louis.
Neither candidate returned a Leader candidate questionnaire.
Wagner, 53, is a former U.S. ambassador to Luxembourg and was the first woman to chair the Missouri Republican party.
Sears, 45, said he works in the biotech industry. He previously ran for the News Hampshire state legislature.
The winner of the primary will compete against Democrat Bill Otto of Maryland Heights and Libertarian Jim Higgins in the November general election.
District 2 covers a small portion of northeastern Jefferson County and extends across most of St. Louis County and into St. Charles County.
The pay for U.S. representative is $174,000 a year, plus allowances. The term is for two years.