Three weeks before critical midterm elections, voters are expressing significantly more interest in turning out than they were four years ago, according to a Washington Post-ABC News poll. Enthusiasm is up across almost all demographic groups, but the increases are greater among younger adults, nonwhite voters and those who say they favor Democrats for the House.

At the same time, President Trump’s job approval rating has risen five points after tying a record low point in August, although Democrats maintain a double-digit advantage in overall support for Congress, the poll finds.

Four years ago, midterm voter turnout fell to its lowest level in more than half a century. Republicans were able to capitalize by expanding their House majority and taking control of the Senate. Today, with that GOP House majority at risk and some close Senate races that will determine who has control of that chamber in January, a 77 percent majority of registered voters say they are certain to vote next month or have already voted, up from a 65 percent majority in Post-ABC polls in October 2014.