I am sure Frist would be a great place to start. We would probably need a majority of GOP senators on board who are willing to change the rules. Pressure from Bush would also help.
Here are the emails for the existing Senate (both Dems and Republicans) have fun.
senator@akaka.senate.gov
senator@bennett.senate.gov
senator@biden.senate.gov
senator_bingaman@bingaman.senate.gov
kit_bond@bond.senate.gov
senator@breaux.senate.gov
jim_bunning@bunning.senate.gov
senator_byrd@byrd.senate.gov
senator@cochran.senate.gov
senator@collins.senate.gov
senator@conrad.senate.gov
senator_domenici@domenici.senate.gov
senator@dorgan.senate.gov
dick@durbin.senate.gov
senator@enzi.senate.gov
russell_feingold@feingold.senate.gov
bob_graham@graham.senate.gov
mailbox@gregg.senate.gov
chuck_hagel@hagel.senate.gov
tom_harkin@harkin.senate.gov
vermont@jeffords.senate.gov
tim@johnson.senate.gov
senator@kennedy.senate.gov
john_kerry@kerry.senate.gov
senator_kohl@kohl.senate.gov
senator_leahy@leahy.senate.gov
senator@levin.senate.gov
senatorlott@lott.senate.gov
senator_lugar@lugar.senate.gov
john_mccain@mccain.senate.gov
senator@mcconnell.senate.gov
senator_murray@murray.senate.gov
senator@nickles.senate.gov
jack@reed.senate.gov
senator@rockefeller.senate.gov
senator@sessions.senate.gov
senator@shelby.senate.gov
olympia@snowe.senate.gov
arlen_specter@specter.senate.gov
senator@stabenow.senate.gov
mailbox@sununu.senate.gov
senator_voinovich@voinovich.senate.gov
senator@warner.senate.gov