BOSTON -- Sen. Edward Kennedy's doctor said the 76-year-old Democratic icon did not suffer a stroke and "is not in any immediate danger."

Dr. Larry Ronan said Kennedy is "resting comfortably," and was watching the Red Sox game with his family.

He said there will be further tests over the next couple of days to determine the cause of the seizure.

Kennedy felt ill Sunday morning at his home and was taken first to a Cape Cod hospital. He was then airlifted to Massachusetts General in Boston.

In October, he had surgery to repair a nearly complete blockage in a major neck artery. Kennedy, the second-longest serving member of the Senate, was elected in 1962, filling out the term won by his brother, President John F. Kennedy.

Kennedy's Senate colleagues -- including the three leading presidential candidates and the Senate majority leader -- have expressed hope for a speedy recovery.

Kennedy was first rushed by ambulance to Cape Cod Hospital after falling ill at the Kennedy compound in Hyannisport, Mass., on Saturday morning.

Hyannis fire responded to the compound after a call was made around 8:30 a.m., the Cape Cod Times newspaper reported on its Web site. After he spent almost two hours in the emergency room, he was transferred to Massachusetts General Hospital, reported WCVB-TV in Boston.

Kennedy, 76, was placed on a stretcher and wheeled out to the MedFlight helicopter around 10:15 a.m., where it took off from Barnstable Municipal Airport, the newspaper reported.

CNN reported that Kennedy himself called another family member around 10:30 a.m. EDT and said he couldn't make a lunch planned for later Saturday. Family members said early Saturday afternoon that they were "guardedly optimistic" about the senator's condition, CNN reported.

Sen. John Kerry of Massachusetts did not talk to reporters when he arrived at the hospital shortly after 1 p.m.

Kerry later issued a statement, saying that Kennedy "been a fighter who has overcome adversity again and again with courage, grit, and determination. Teresa and I are praying" for Kennedy's family.

"We know that everyone in Massachusetts and people throughout the nation pray for a full and speedy recovery for a man whose life's work has touched millions upon millions of lives," the statement said.

The campaign for Sen. Barack Obama, who Kennedy endorsed earlier this year, released a statement from Obama saying, "My thoughts and prayers are with Teddy; He is one of my favorite people."

Arizona Sen. John McCain, the likely GOP presidential nominee, also released a statement saying, "Sen. Kennedy's role in the U.S. Senate cannot be overstated. He is a legendary lawmaker, and I have the highest respect for him. When we have worked together, he has been a skillful, fair and generous partner."

Sen. Hillary Rodham Clinton discussed Kennedy during a campaign stop in Loretto, Ky., on Saturday, saying, "Our thoughts and prayers are with him and his family because he has been a champion for health care ... I know that we all join together in wishing him well."