From a WaPo piece:
Public officials who would make excellent candidates should they run on this platform include Sens. Russ Feingold, Bernie Sanders, Barbara Mikulski or Al Franken; or Reps. Joe Sestak, Maxine Waters, Raul Grijalva, Alan Grayson, Barbara Lee, Dennis Kucinich, Lois Capps, Jim Moran or Lynn Woolsey. Others include Jim McGovern, Marcy Kaptur, Jim McDermott or John Conyers.