High levels of enthusiasm about voting among the Democratic base could threaten Donald Trump's hold on both houses of Congress, according to new analysis.

This mid term election sees Democrats and those that lean Democratic at their most enthusiastic about voting than at any other mid term vote since 1994.

But with the key demographic groups that the Democrats rely on - such as young people and Hispanics - often not turning out to vote in high numbers, all eyes will be on the party machine's ability to convince people to go to the ballot box.

The latest polling indicates that Donald Trump and the Republicans could still hold onto both houses, although the House of Representatives looks increasingly likely to fall to the Democrats.

The economic picture in America is doing well, a positive for the Republicans, but polling shows that President Trump is unpopular nationwide.