Here are the senators seeking re-election this year. Asterisks indicate those who are newly opposed to PIPA.
Dianne Feinstein (D-CA)
Tom Carper (D-DE)
Bill Nelson (D-FL)
Ben Cardin (D-MD) *
Debbie Stabenow (D-MI)
Amy Klobuchar (D-MN)
Claire McCaskill (D-MO)
Jon Tester (D-MT)
Bob Menendez (D-NJ)
Kirsten Gillibrand (D-NY)
Sherrod Brown (D-OH)
Bob Casey, Jr. (D-PA)
Sheldon Whitehouse (D-RI)
Maria Cantwell (D-WA)
Joe Manchin (D-WV)
Richard Lugar (R-IN)
Olympia Snowe (R-ME) *
Scott Brown (R-MA) *
Roger Wicker (R-MS)
Dean Heller (R-NV)
Bob Corker (R-TN)
Orrin Hatch (R-UT) *
John Barrasso (R-WY)
Bernie Sanders (I-VT)
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Betting sites like Intrade are lagging indicators with respect to the polls. Bettors adjust their bets whenever new polls are released, but it doesn't generally work the other way around (people responding to pollsters don't do so on the basis of what they saw on Intrade).