The Democratic leader still faces skeptics in his ranks and hostility from some activists, but aides say he has enough commitments of support to be elected majority leader.
Senator Chuck Schumer, Democrat of New York, and his political team engaged in a $550 million push to put more Senate seats in play and increase their chances of regaining the majority.
President Trump on Monday was the latest big political star to swing through Mississippi and boost a candidate in a red-state Senate race that suddenly seems competitive.
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