By Elizabeth Daley PUNXSUTAWNEY, Pennsylvania (Reuters) – Punxsutawney Phil, a famed U.S. groundhog with an even more famous shadow, huddled in his burrow on Sunday as winter lovers and haters waited for him to emerge and signal how much longer frigid weather will last. The rotund rodent is scheduled to exit his subterranean residence at Gobblers Knob in the western Pennsylvania town of Punxsutawney at 7:20 a.m. on Groundhog Day, according to groundhog.org. The annual event, made even more …