Amid a recent barrage of speculation surrounding his presidential aspirations, former Mayor of New York City Rudolph Giuliani may be used to receiving career advice. But on Saturday, he played the advisor and implored the Class of 2011 to work toward the public good.

ST. LOUIS (AP) — Republican presidential candidate Rudy Giuliani was released from a St. Louis hospital Thursday after spending the night to undergo tests for flu-like symptoms.

"I feel great. Take care. Merry Christmas, I'm feeling fine thanks to the hospital. They did a good job," a smiling and waving Giuliani said as he left Barnes-Jewish Hospital en route to returning to New York.

His campaign said he would make planned stops in New Hampshire Saturday and Sunday.

The former New York mayor felt the symptoms while campaigning for the nomination in Missouri, and they soon became worse, campaign spokeswoman Katie Levinson said late Wednesday. She did not describe the symptoms beyond those being commonly associated with the flu.