Colorado Democrats needed all four remaining Senate contests to swing their way to gain a supermajority in the state Senate. At 11:49 a.m. on Thursday, AP called state Senate district 15 for Republican Marc Catlin over his Democratic opponent, Cole Buerger. Catlin bested Buerger by about 4%, or 3,500 votes.

Colorado Republicans denied Democrats a supermajority in the state Senate. But Democrats were likely to renew their large edge in the House.

By the end of Election Day, Colorado Democrats in the state House and Senate could confidently say they retained majorities, but it was too early to tell how wide that margin will be as key races were not yet called,