I probably should have provided context. Of the two Democratic and two Republican sponsors, Cruz ® is the one is actively campaigning against student debt relief in the press.
Also, of the people that voted for tanking Biden’s debt relief plan, only 3 were democrats. Tester, Manchin, and Sinema. The latter two are famously out of step with their party.
All in all, the Democratic Party has a track record of supporting student debt relief, and the Republican Party has a track record of opposing it. Also, of the people sneaking anti debt relief language in this bill, odd are is was the big anti-debt relief tea party republican.