Via The Hill:

Sen. Mike Lee (R) said Friday that he wouldn’t endorse fellow Utah Sen. Orrin Hatch (R) for reelection in the 2012 GOP Senate primary. Lee, a freshman senator allied with the conservative Tea Party movement, said he would stay neutral in the Republican primary, paving the way for a conservative challenger to Hatch.
“It’s not my intention to support any candidate until the democratic process has had a chance to play itself out in Utah,” Lee said on MSNBC.