Presidential hopeful Mitt Romney on Monday said he would welcome Republican rival Fred Thompson to the race, but also took some jabs at Thompson's long delay in formally announcing his candidacy. Thompson, the "Law & Order" television actor and former senator from Tennessee, is expected to officially enter the race this week. Instead of attending a Wednesday night debate in Durham, N.H., Thompson will be in Los Angeles to appear on "The Tonight Show with Jay Leno." "I think it will boost the ratings for Jay Leno's show, but I'd rather be doing well in New Hampshire," said Romney, who...