Rep. Tom Tancredo, a vocal critic of President Bush's immigration policy, says he will run for president in 2008 if no one else steps forward to press the issue.The Colorado Republican was in Nashua, N.H., on Monday, speaking to the Nashua Republican City Committee."I don't consider myself a candidate today," Mr. Tancredo said, when asked if he is considering a presidential run, adding: "If no one will take this banner up - and I say this with great trepidation - yeah, I will. I don't know what else to do."