WATCH LIVE: 'Democracy Spring' protesters hold mass sit-in at US Capitol

Demonstrators are holding a "Democracy Spring" sit-in at the U.S. Capitol Building to protest the Supreme Court's Citizens United decision and big money in politics. Hundreds of people have pledged to be arrested during the event, according to organizers.

"The enthusiastic public response to Democracy Spring demonstrates Americans’ deep frustration with a political system they no longer feel hears their voices. Democracy Spring will turn widespread frustration into a powerful force to fulfill our country’s promise of government of, by, and for the people," said Democracy Spring lead organizer Kai Newkirk in a statement released Monday.

The protesters are demanding Congress to pass four bills related to money in politics and voting rights: the Government by the People Act and Fair Elections Now Act, the Voting Rights Advancement Act of 2015, the Voter Empowerment Act of 2015 and the Democracy for All Amendment.

Watch video, as posted online, below: