About 20 percent of Americans say they have attended a protest or political rally since 2016, according to a Washington Post poll released Friday.

The Washington Post–Kaiser Family Foundation poll found that tens of millions of Americans, about 1 in 5, say they have attended an in-person political rally or mass protest since the beginning of 2016.

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Of those Americans, 19 percent said they had never before attended a similar event, suggesting a wave of activism that could be felt in this year's midterm elections.

Out of the group of Americans who said they have attended a rally or protest since 2016, 70 percent are opposed to President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE and say they do not support his agenda, compared with 30 percent who said they attended rallies while supporting the president.

A full third of Americans who have protested since the beginning of 2016 say they plan to attend future political events or volunteer for a congressional campaign this year.

“This confirms there is a resistance and that a lot of people want to be associated with it,” Georgetown University history professor Michael Kazin told the Post.

Eighty-nine percent of those surveyed who said they had attended a political event said they planned to vote in the upcoming elections. Democrats are hoping to retake the House and Senate in November; they will need a net gain of 23 seats to take over the majority in the House and a net gain of two seats in the Senate.

Democrats currently hold about an 8-point advantage over Republicans on a generic House ballot, the Cook Political Report notes, and a recent Morning Consult poll showed President Trump with a 41 percent approval rating with 54 percent of those surveyed disapproving of his job as president.

Still, winning back the House could prove a tough climb, and the Senate map heavily favors the GOP, with Democrats defending 26 incumbent seats, compared to only 9 seats for Republicans.