As hearings on Supreme Court justice nominee Brett Kavanaugh are underway, activists have raised $330,000 and counting of pledged money for a future challenger to Republican Sen. Susan Collins, a critical swing vote. Progressive activist Ady Barkan, who has the impairing condition of Lou Gehrig’s disease, spent the last five months crisscrossing the United States to campaign against Republicans who supported Donald Trump’s tax law.

In mid-August, he announced an innovative tactic for pressuring Maine’s Collins to vote “no” on Kavanaugh’s confirmation. Using the website CrowdPac — which allows users to pledge a certain amount of campaign funding should certain conditions be met — the campaign announced that it would be collecting pledges for a future Democratic challenger to Collins. The pledges only activate (and then users are charged) if Collins votes in favor of Kavanaugh’s nomination. If she opposes him, they will be wiped out. The campaign released a video of Mainers calling on Collins to oppose Kavanaugh over the long weekend:

Maine voters -- @SenatorCollins constituents -- are standing up today to let her know: if she votes for Kavanaugh, they will defeat her. Watch the new video, and pledge $20.20 at https://t.co/VshoGeTtcG to defeat Susan Collins *if* she votes for Kavanaugh #StopKavanaugh pic.twitter.com/jjrKMouiAL — Be A Hero (@BeAHeroTeam) September 4, 2018

As of the second day of the Kavanaugh hearings, the campaign is well more than than halfway to the $500,000 goal of the page.