From the Union Voice, here are the Senate co-sponsors of the deceptively-named Employee Free Choice Act:

Senator Daniel Akaka
Senator Mark Begich
Senator Barbara Boxer
Senator Sherrod Brown
Senator Roland Burris
Senator Robert Byrd
Senator Maria Cantwell
Senator Benjamin Cardin
Senator Tom Carper
Senator Bob Casey
Senator Chris Dodd
Senator Dick Durbin
Senator Russ Feingold
Senator Kirsten Gillibrand
Senator Tom Harkin
Senator Daniel Inouye
Senator Tim Johnson
Senator Ted Kaufman
Senator Edward Kennedy
Senator John Kerry
Senator Amy Klobuchar
Senator Frank Lautenberg
Senator Patrick Leahy
Senator Carl Levin
Senator Joe Lieberman
Senator Robert Menendez
Senator Jeff Merkley
Senator Barbara Mikulski
Senator Patty Murray
Senator Bill Nelson
Senator Jack Reed
Senator Harry Reid
Senator Jay Rockefeller
Senator Bernie Sanders
Senator Charles Schumer
Senator Jeanne Shaheen
Senator Debbie Stabenow
Senator Tom Udall
Senator Sheldon Whitehouse
Senator Ron Wyden

Here are the Senators that haven’t co-sponsored the bill (i.e. They think keeping secret ballots is a good idea, hopefully):

Senator Max Baucus
Senator Evan Bayh
Senator Michael Bennet
Senator Jeff Bingaman
Senator Kent Conrad
Senator Byron Dorgan
Senator Dianne Feinstein
Senator Kay Hagan
Senator Herb Kohl
Senator Mary Landrieu
Senator Blanche Lincoln
Senator Claire McCaskill
Senator Ben Nelson
Senator Mark Pryor
Senator Jon Tester
Senator Mark Udall
Senator Mark Warner
Senator Jim Webb