Although all eyes seem to be on the presidential contest, US voters are also electing lawmakers to a new Congress on Tuesday. The vote will decide all 435 members of the House of Representatives – currently controlled by Republicans – and one-third of the seats in the Senate, where Democrats have the edge. Polls have indicated that control of each body could switch to the other party, although this is by no means certain. If this does happen, it would mark the first time that both legislative bodies have flipped at the same time – but is unlikely to end the partisan problems plaguing the chamb…