Fall Out Boy have contributed $50,000 to a campaign to fight Proposition 8, a ballot initiative facing California voters this November. The bill would change the California Constitution to eliminate the right of same-sex couples to marry in California. A new section would be added stating "only marriage between a man and a woman is valid or recognized in California." The measure was submitted for the ballot by petitioners with the title "California Marriage Protection Act."

The band joins a number of people who have publicly condemned the proposition, including Governor Arnold Schwarzenegger, Senator Barack Obama and celebrities like Brad Pitt and Steven Spielberg.