These Congress Members Sponsored Single-Payer Healthcare Last Time, But Not Yet This Time

HR 676 has 72 cosponsors, but had 93 in the last Congress. Why? You'd have to ask the following congress members who signed on last time and have not yet done so this time:

Joe Baca, CA-43
Andre Carson, IN-7
Donna Christensen, VI
James Clyburn, SC-6
Phil Hare, IL-17
Rush Holt, NJ-12
Eddie Bernice Johnson, TX-30
Stephen Lynch, MA-9
James Moran, VA-8
Eleanor Holmes Norton, DC
Charles Rangel, NY-15
Laura Richardson, CA-37
Lucille Roybal-Allard, CA-34
Linda Sanchez, CA-39
Loretta Sanchez, CA-47
Janice Schakowsky, IL-9
David Scott, GA-13
Jose Serrano, NY-16
Betty Sutton, OH-13
Edolphus Towns, NY-10
Anthony Weiner, NY-9

*Note that it is coincidence that this list contains exactly 21 members. Several sponsors last time are no longer in Congress. Several members have sponsored who did not do so last time.