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Senator Party State Supports or has previously supported Voluntarily e-files
Lamar Alexander R Tenn. x  
Tammy Baldwin D Wis. x  
John Barrasso R Wyo.    
Michael F. Bennet D Colo. x  
Richard Blumenthal D Conn. x  
Roy Blunt R Mo.    
Cory A. Booker D N.J. x  
John Boozman R Ark.    
Sherrod Brown D Ohio x  
Richard Burr R N.C.    
Maria Cantwell D Wash. x  
Shelley Moore Capito R W.Va.    
Benjamin L. Cardin D Md. x  
Thomas R. Carper D Del. x  
Robert P. Casey D Pa. x  
Bill Cassidy R La.    
Thad Cochran R Miss. x x
Susan M. Collins R Maine x  
Christopher A. Coons D Del. x  
Bob Corker R Tenn.    
John Cornyn R Texas x x
Catherine Cortez Masto D Nev.    
Tom Cotton R Ark.    
Mike Crapo R Idaho    
Ted Cruz R Texas    
Steve Daines R Mont. x  
Joe Donnelly D Ind. x x
Tammy Duckworth D Ill. x  
Richard J. Durbin D Ill. x  
Michael B. Enzi R Wyo. x  
Joni Ernst R Iowa x  
Dianne Feinstein D Calif. x x
Deb Fischer R Neb.    
Jeff Flake R Ariz.    
Al Franken D Minn. x x
Cory Gardner R Colo. x  
Kirsten E. Gillibrand D N.Y. x x
Lindsey Graham R S.C. x  
Chuck Grassley R Iowa x x
Kamala D. Harris D Calif.   x
Margaret Wood Hassan D N.H. x  
Orrin G. Hatch R Utah x  
Martin Heinrich D N.M. x x
Heidi Heitkamp D N.D. x  
Dean Heller R Nev.    
Mazie K. Hirono D Hawaii x  
John Hoeven R N.D.    
James M. Inhofe R Okla.    
Johnny Isakson R Ga. x  
Ron Johnson R Wis.    
Tim Kaine D Va. x  
John Kennedy R La.    
Angus S. King I Maine x x
Amy Klobuchar D Minn. x  
James Lankford R Okla.    
Patrick J. Leahy D Vt. x x
Mike Lee R Utah    
Joe Manchin D W.Va. x  
Edward J. Markey D Mass. x  
John McCain R Ariz. x  
Claire McCaskill D Mo. x x
Mitch McConnell R Ky.    
Robert Menendez D N.J. x  
Jeff Merkley D Ore. x  
Jerry Moran R Kan.    
Lisa Murkowski R Alaska x  
Christopher Murphy D Conn. x  
Patty Murray D Wash. x  
Bill Nelson D Fla.    
Rand Paul R Ky.    
David Perdue R Ga.    
Gary C. Peters D Mich. x x
Rob Portman R Ohio x  
Jack Reed D R.I. x x
James E. Risch R Idaho    
Pat Roberts R Kan.    
Mike Rounds R S.D. x  
Marco Rubio R Fla.    
Bernard Sanders I Vt. x x
Ben Sasse R Neb.    
Brian Schatz D Hawaii x  
Charles E. Schumer D N.Y. x x
Tim Scott R S.C. x  
Jeff Sessions R Ala.    
Jeanne Shaheen D N.H. x  
Richard C. Shelby R Ala.    
Debbie Stabenow D Mich.    
Dan Sullivan R Alaska    
Jon Tester D Mont. x x
John Thune R S.D.    
Thom Tillis R N.C.    
Patrick J. Toomey R Pa.    
Tom Udall D N.M. x  
Chris Van Hollen D Md. x  
Mark R. Warner D Va. x x
Elizabeth Warren D Mass. x x
Sheldon Whitehouse D R.I. x x
Roger F. Wicker R Miss. x  
Ron Wyden D Ore. x x
Todd Young R Ind.    

Source: Center for Public Integrity research, reporting and analysis of filings with Federal Election Commission, as of Feb. 2, 2017.