FILE - In this May 4, 2004, Utah Republican Sen.s Robert Bennett, left, and Orrin Hatch, center, talk on stage during the state Republican convention in Sandy, Utah. When the three-term Bennett lost re-election in 2010, it sent shock waves through the Republican Party and heralded a revolt that saw tea-party-backed candidates, like Christine O'Donnell, Sharron Angle and Marco Rubio, topple more established, mainstream Republicans. Disgruntled conservatives planted the seeds for Bennett's defeat, and now some of them hope to replicate their success against six-term Hatch Thursday, March 15, 2012, in Utah?s Republican caucuses. (AP Photo/Douglas C. Pizac, File)