Counting is still underway in five U.S. states, with Democrats winning in two and Republicans in three.

The Senate is likely to be split 50-50. With that, Kamala Harris will ensure the Democrats have a majority.

Reasons for the Republicans' failure: the gun issue and Trump. 28% of voters said their vote in the House election was "against Trump," and 90% of them supported Democrats.

56% of those polled by NBC support stricter gun control. Of those, 76% supported Democratic candidates.