Democrat Tammy Baldwin scored a narrow win in the U.S. Senate race in Wisconsin over former GOP governor and longtime politician Tommy Thompson on Tuesday. She held the seat for Democrats (Herb Kohl retired) and made history by becoming the first openly gay member of the Senate, the Associated Press reports.

And in North Dakota, Democrat Heidi Heitkamp was on the verge of an upset in the Senate race there early Wednesday morning, leading Republican Rep. Rick Berg by 2,994 votes, a 50.25 percent to 49.31 percent margin, the Bismarck Tribune reported. The race early in the campaign had been viewed as a longshot for Democrats.

The races were highlights for Democrats nationwide Tuesday night. Heitkamp and Baldwin helpd Democrats hold their majority in the U.S. Senate, as Republicans kept control of the U.S. House.

That leaves Congress divided in the same way it has been for the last two years, which created gridlock on Capitol Hill on some of the nation’s most pressing issues, the Washington Post notes.