MJ Hegar

MJ Hegar in her campaign video announcing a run for the U.S. Senate.
Courtesy / MJ For Texas

MJ Hegar announced Tuesday she is running for the U.S. Senate in 2020, challenging Texas Sen. John Cornyn for a seat he's held since 2002. 

Bob Daemmrich for The Texas Tribune

In a Texas congressional district that includes one of the country's largest military bases, a military hero is betting she can stage a political upset.