Lamar Alexander (R-TN)
Robert Bennett (R-UT)
Thad Cochran (R-MS)
John Cornyn (R-TX)
Michael Crapo (R-ID)
Michael Enzi (R-WY)
Chuck Grassley (R-IA)
Judd Gregg (R-NH)
Orrin Hatch (R-UT)
Trent Lott (R-MS)
Lisa Murkowski (R-AK)
Richard Shelby (R-AL)
John Sununu (R-NH)
Craig Thomas (R-WY)
George Voinovich (R-OH)

This is 27% of ALL Republican Senators. There were no Democrats who declined to co-sponsor the bill.