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Maryland Republicans are only targeting one seat in the fall: the 6th District seat occupied by Rep. John Delaney. Former Secret Service agent Dan Bongino will challenge Mr. Delaney after winning Tuesday’s Republican primary.

Mr. Bongino has raised more than $500,000 for his campaign. However, he would likely have to garner some Democratic support in the redrawn western Maryland district, which includes parts of heavily Democratic Montgomery County, a suburb of Washington, D.C.