In this 2017 file photo, Cori Bush speaks on a bullhorn to protesters outside the St. Louis Police Department headquarters. Bush is projected to top longtime Rep. William Lacy Clay in Missouri’s 1st Congressional District Democratic primary.

FILE – In this Sept. 17, 2017 file photo, Cori Bush speaks on a bullhorn to protesters outside the St. Louis Police Department headquarters in St. Louis. Few members of Congress are more entrenched than William Lacy Clay of St. Louis, but Bush, a once-homeless woman spurred to activism in Ferguson believes she could be the next Democrat to pull off a big primary upset. Bush watched in June as Alexandria Ocasio-Cortez shocked the political establishment by beating 10-term Rep. Joseph Crowley in the New York Democratic primary. Bush is optimistic heading into Missouri’s Aug. 7 primary. (AP Photo/Jeff Roberson File)