The U.S. Capitol. (Drew Angerer/Getty Images)

WASHINGTON— Tuesday’s election was a disaster for congressional Democrats, who were expected to pick up nearly a dozen GOP seats in the House but instead lost races while also failing to flip Senate seats held by vulnerable Republicans.

The outlook for Democratic control of the Senate did not improve the day after the election, either, as Republican Sen. Susan Collins triumphed in an expensive contest against Democrat Sara Gideon in Maine.

Five Senate races remained uncalled but it appeared unlikely that Democrats would win enough of them to capture the majority. (Virginia Democratic Sen. Mark Warner coasted to victory Tuesday night).