Sen. Joe Manchin Joseph (Joe) ManchinMomentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' Barrett seen as a front-runner for Trump Supreme Court pick MORE (D-W.Va.) brought in more than $1.4 million in the second quarter of the year.

The West Virginia Democrat now has nearly $3.5 million on hand, according to Politico.

Manchin is considered one of the more vulnerable Democratic senators as President Trump won his state by a large margin.

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In a statement to Politico, Manchin said people in his state are "tired of partisan negativity getting in the way of good government."

"I'm running on a record of consensus-building on behalf of the people of the Mountain State — hard-working West Virginians who deserve elected leaders who always put their interests ahead of politics," he added.

On Monday, West Virginia Republican Attorney General Patrick Morrisey launched his Senate bid.

Morrisey's announcement sets up a primary clash between two high-profile Republicans looking to unseat Manchin.

Morrisey had long been expected to make a bid for the Senate seat, and his decision sets up a Republican primary fight with Rep. Evan Jenkins (W-Va.).