then why have republicans been privately and dreadfully telling reporters that they fear Hillary can't be stopped? Why are they so depressed when they say this if Hillary is supposedly so conservative?
Because they're sore losers, and they can't stand the thought of
any Democrat regaining the White House. This is the party that spent eight years trying to destroy the most conservative Democratic President since Grover Cleveland, after all.
But there are a few Republicans who will admit that if they
must lose the White House to a Democrat, they'd prefer it to be Hillary. At the very least, she'll stay the course in Iraq; impose sanctions on Iran or actually invade; and stick to a cautious, poll-drive domestic program.
Republicans don't really mind prowar centrist Democrats, as the case of Joe Lieberman demonstrates. They will never vote for Hillary, but they'll raise a glass to her foreign policy all the same.