The Republican congressional candidate whose campaign was linked to an intimidating letter to Hispanic voters promised Sunday to stay in the race despite pressure to withdraw. "I'm innocent. There's no way in hell I'm going to withdraw," Tan Nguyen told reporters at his campaign headquarters. "I'm not going to quit this race; I'm going to win this race." Nguyen, a Vietnamese immigrant trying to unseat popular Democratic Rep. Loretta Sanchez, last week blamed an unidentified female staffer for sending out 14,000 letters warning immigrants they could be deported or jailed for voting in next month's election. The mailings have sparked...