Yes, "getting primaried" = mounting surprising (and potentially counter-productive) opposition to someone in the primary.
For instance, as in 2018 or 2020, MAGA folk might "primary" (and unseat) a popular candidate, in favour of an extremist—and then lose that seat in the subsequent election.
But everyone always has to go through a primary. (For most popular incumbents though—like Biden against Dean Phillips in 2024—it's usually a technicality.)
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For instance, as in 2018 or 2020, MAGA folk might "primary" (and unseat) a popular candidate, in favour of an extremist—and then lose that seat in the subsequent election.