They may not be old enough to cast ballots November 8, but thousands of teenagers around the country are tapping into this uproarious political season through a popular and anonymous mobile messaging app.

After School, a two-year-old app with millions of student users at 20,000 high schools, is hosting a mock presidential election during the last few critical weeks before Election Day.

The app’s Election Center feature went live Friday morning, and as of Monday afternoon, 70,000 students had voted in the mock election, a spokesman said. The choices: Democratic Party nominee Hillary Clinton, Libertarian Party nominee Gary Johnson, Green Party nominee Jill Stein or Republican Party nominee Donald Trump. Each student gets one vote.