39 senators who now support changing or eliminating the filibuster previously opposed doing so

In addition to Blumenthal and Sanders, 11 other senators who have called for eliminating the legislative filibuster previously supported the procedure: Sherrod Brown (Ohio), Ben Cardin (Md.), Robert P. Casey Jr. (Pa.), Kirsten Gillibrand (N.Y.), Mazie Hirono (Hawaii), Martin Heinrich (N.M.), Amy Klobuchar (Minn.), Edward J. Markey (Mass.), Jacky Rosen (Nev.), Brian Schatz (Hawaii) and Chris Van Hollen (Md.).

Source: WP