Why is Hillary being asked to leave the race?

Why if both candidates are running pretty close in the polls is the female candidate being asked to leave the race?  I know that Obama has a few more delegates than Hillary but the race is still very tight.  The democratic party wants female voters but I guess we are not good enough to be president?  I see.  I think I understand this now.  I mean they didn't ask Obama to quit.  I still am not sure who I would like to see as the democratic candidate but at this point I am so disgusted I may have to vote for MCcain.