BOSTON - Sen. Edward M. Kennedy, the lone surviving son in a famed political family who helped define national Democratic Party politics, suffered a seizure at his Cape Cod home Saturday. He was recovering in good spirits at a Boston hospital.

Kennedy, 76, did not suffer a stroke and "is not in any immediate danger," said Larry Ronan, the senator's primary care physician.

"He's resting comfortably and watching the Red Sox game with his family," Ronan said. "Over the next couple of days, Senator Kennedy will undergo further evaluation to determine the cause of the seizure, and a course of treatment will be determined at that time."

Kennedy's wife, Victoria, three of his children and his niece Caroline Kennedy were among those with him at the hospital.

On Saturday morning, Kennedy felt ill at home and went to Cape Cod Hospital. After a discussion with his doctors in Boston, the senator was flown to Massachusetts General Hospital.

Senate Majority Leader Harry Reid said he spoke to Kennedy's wife in the afternoon and was told "his condition is not life-threatening, but serious."

In October, Kennedy had surgery to repair a nearly complete blockage in a major neck artery. The discovery was made during a routine examination of a decades-old back injury.

The hourlong procedure on his left carotid artery -- a main supplier of blood to the face and brain -- is a type of procedure performed on more than 180,000 people a year to prevent a stroke.

Kennedy, the second-longest serving member of the Senate, was elected in 1962. He is active for his age, maintaining an aggressive schedule on Capitol Hill and across Massachusetts.