National Republicans are launching a multi-million-dollar field effort in four blue states, a move that comes as Democrats express mounting concern that a Bernie Sanders nomination could doom them in critical down-ballot contests.

The Republican National Committee is deploying dozens of field staffers to California, New Jersey, New York and Illinois. While none of the four states is remotely in play at the presidential level, each has numerous competitive House races and played a critical role in helping Democrats capture the chamber in 2018.

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The committee is also dispatching staff to Nebraska. While the state is certain to go for President Donald Trump in November, it is home to the district where endangered Republican Rep. Don Bacon is seeking reelection.

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