Common Cause v. Biden: Filibuster challenge brought by DREAMers, Common Cause, and members of Congress
D.C. District decision in Common Cause v. Biden:
http://sblog.s3.amazonaws.com/wp-content/uploads/2012/12/Sullivan-filibuster-ruling-12-21-12.pdf
CC Appeal brief in Common Cause v. Biden:
http://www.commoncause.org/atf/cf/%7bFB3C17E2-CDD1-4DF6-92BE-BD4429893665%7d/FILIBUSTER%20APPEAL%20BRIEF%206-18.PDF