Alexandria Ocasio-Cortez’s shocking primary victory in New York over House Democratic Caucus Chairman Joseph Crowley raised the question: Who could be the next incumbent Democrat to go down? Ocasio-Cortez and her allies are hoping it will be Missouri Rep. William Lacy Clay.

Four Democrats, including Clay, will be on the primary ballot Tuesday for the St. Louis-based 1st District, but the nine-term congressman’s biggest threat comes from nurse and activist Cori Bush. Ocasio-Cortez traveled to St. Louis to campaign with Bush, who casts herself as part of a new generation of bold progressive leaders.

Clay has faced primary threats before, but some Democrats think this will be his closest race yet. Still, they were confident Clay would win.

“I do think that Ocasio-Cortez emboldened all challengers to sitting established Democrats across the country,” said former Missouri state Rep. Don Calloway, who previously represented the St. Louis area and is backing Clay.

Calloway warned against applying the New York primary example to other contests. He noted that the demographics in Crowley’s district had shifted underneath the longtime lawmaker and suggested Crowley was asleep at the wheel and didn’t recognize Ocasio-Cortez as a threat.