After 54 days of filibuster, Senators Hubert Humphrey (D-MN), Mike Mansfield (D-MT), Everett Dirksen (R-IL), and Thomas Kuchel (R-CA), introduced a substitute bill that they hoped would attract enough Republican swing votes in addition to the core liberal Democrats behind the legislation to end the filibuster. The compromise bill was weaker than the House version in regard to government power to regulate the conduct of private business, but it was not so weak as to cause the House to reconsider the legislation.