Hillary Clinton should hang in there and run a good race. And she has vowed to do so.Clinton has been under unprecedented pressure to bow out of the divisive Democratic primary and to clear the field for her opponent -- Sen. Barack Obama of Illinois.Among those who want her to throw in the towel are, of course, Obama's supporters. But many other Democrats are trying to push her out of the contest on the ground that a contentious race can hurt the party and could help their Republican opponent, Sen. John McCain of Arizona.Clinton also has been deserted by some...