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Senator John Hickenlooper of Colorado defeated progressive state Senator Julie Gonzales in the Democratic primary Tuesday, handing the party's moderate wing a rare victory in a midterm cycle that has otherwise tilted sharply left.
The outcome slows, but does not stop, a wave of insurgent primary campaigns that has unseated veteran incumbents across the country and forced a visible reckoning inside the Democratic Party over how aggressively to oppose President Donald Trump.
What the Primary Fight Was About A primary challenge is a contest within a party in which an elected official faces a rival from the same party rather than the opposition.
In practice, primary challenges are how parties signal whether they want to move toward the center or away from it.
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