Primary challengers threaten to unseat House members across the country

Four House members have already lost re-election bids so far this year, just a few months into primary season.

Four House incumbents have already lost re-election bids so far this year, just a few months into primary season. And about a dozen more are facing legitimate threats in the coming months.

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Two Republican incumbents are squaring off for one district in California this week, the latest example of redistricting changing not just general elections but primaries as well, after two Democratic members lost in Texas last week.

Add NBC News to GoogleRep. Al Green loses seat to Rep. Christian Menefee in Democratic primary01:43But the heaviest upcoming primary action will be on the Democratic side. A handful of Democratic incumbents in California will also face energetic challengers arguing that voters want a fresh face, part of a national slate of anti-incumbent candidates focused on generational change. A wealthy incumbent Democrat in Maryland is running against an even wealthier former congressman in a primary there.