Back last September, The Onion AV Club reported:

The A.V. Club is delighted to point you to a free download of a new live collaboration between Wilco and Fleet Foxes, a cover of Bob Dylan's "I Shall Be Released" which was recorded in Bend, OR on the recent Wilco tour. Wilco's working with Headcount.org, "a nonpartisan, non-profit organization dedicated to voter registration and inspiring participation in democracy through the power of music." So when you download this track, you'll be asked to click a simple button, pledging to vote in the upcoming national election on November 4. And if you're feeling particularly generous, Wilco's also suggesting you make a donation to Second Harvest/Feed America.