To challenge (an incumbent sitting politician) for their political party's nomination to run for re-election, through running a challenger campaign in a primary election, especially one that is more ideologically extreme.
Borrowed from Latin prīmārius ("of the first (rank); chief, principal; excellent"), from prīmus (first; whence the English adjective prime) + -ārius (whence the English suffix -ary); compare the French primaire, primer, and premier.
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