Bangladesh, Aug. 10 -- Wisconsin Lt. Gov. Mandela Barnes won the Democratic Senate primary on Tuesday and will face two-term Republican Sen. Ron Johnson in what is expected to be one of the country's most competitive races for control of the U.S. Senate.

Barnes' top rivals dropped out of the race late last month and backed the former legislator, a sign of Democrats' intense focus on defeating Johnson, who is one of former President Donald Trump's most vocal supporters. The Senate is currently split 50-50, with Democrats relying on the vice president to break ties, and the Wisconsin contest is one of the few races seen a toss-up in November.

Voters also were choosing a Republican nominee for Wisconsin governor who could reshape how elect...