Democratic interference in Republican primaries paid off in some places but not others, election-denying candidates were halted in Colorado, and incumbents proved their staying power.
Democrats meddled to boost State Senator Darren Bailey in the G.O.P. primary for Illinois governor. But efforts to elevate far-right candidates in Colorado fizzled.
The primary contest between Republican Representatives Mary Miller and Rodney Davis has pitted a hard-right figure styling herself in Trump’s image against a traditional, pragmatic conservative.