President Bush yesterday said Americans will soon realize they need the immigrants and foreign temporary workers that would have been allowed by his immigration bill, which was defeated in the Senate last month. Mr. Bush, in a town hall session in Nashville, Tenn., also refused to say whether he will pardon two U.S. Border Patrol agents convicted of shooting a fleeing drug-smuggling suspect, saying the prosecutor was a friend of his who made his case to the jury that convicted the agents. If Mr. Bush was hoping the immigration issue would disappear after his bill's failure, those hopes were dashed,...