ILL: US Senator Ted Kennedy has been hospitalised after suffereing a seizure
US Senator Edward Kennedy, a leading Democrat and patriarch of a prominent American political dynasty, has been hospitalised after suffering a seizure at his Cape Cod vacation home.

Kennedy, 76, was rushed from the family compound at Hyannisport, Massachusetts, to Cape Cod Hospital at 9am Saturday (1pm Sunday NZT), before being airlifted to Boston.

"He is undergoing a battery of tests at Massachusetts General Hospital to determine the cause of the seizure," his office in Washington said in a statement.

"Senator Kennedy is resting comfortably, and it is unlikely we will know anything more for the next 48 hours," it added.

The Boston Globe reported Kennedy, youngest brother of assassinated US President John F Kennedy, suffered one seizure at his Cape Cod home and a second seizure aboard the helicopter transport flight to Boston.

The long-serving Massachusetts senator was joined by family members in Boston including his eldest son, Edward Kennedy Jr, 46, who was at the hospital, a Reuters photographer reported.

Kennedy, the second-longest serving member of the current US Senate, is a leading liberal voice in the United States and has actively campaigned for Barack Obama in his bid for the Democratic presidential nomination.

"As I've said many times before, Ted Kennedy is a giant in American political history. He's done more for the health care of others than just about anybody in history," Obama told reporters during a visit to a hospital in Eugene, Oregon.

"We are going to be rooting for him, and I, I insist on being optimistic about how it's going to turn out."

Campaigning in Kentucky, Senator Hillary Clinton, Obama's rival for the Democratic Party's presidential nomination, offered her wishes for the senator's quick recovery.

Kennedy has been a vocal critic of Republican President George W. Bush, particularly on his Iraq war, tax cuts for the wealthy and conservative nominees to the US Supreme Court who he fears will push the high court to the right.

But he also worked closely with Republicans on legislation including Republican presidential candidate John McCain on the controversial immigration issue.

"He is a legendary lawmaker," McCain said in a statement. "When we have worked together, he has been a skilful, fair and generous partner. I consider it a great privilege to call him my friend."

The white-haired senator has had other brushes with ill health. He had preventive surgery at Boston's Massachusetts General Hospital in October to unclog a partially blocked carotid artery in his neck.

The blockage was discovered during a routine check of Kennedy's back and spine, doctors said. A blocked carotid artery can lead to a stroke and death, they said at the time.

Kennedy has suffered from back problems since a plane crash in 1964 in which the pilot and one of Kennedy's aides were killed and the senator was pulled from the wreckage with a punctured lung, broken ribs and internal bleeding.

Kennedy came to the Senate in November 1962 to fill a seat earlier held by his older brother, then President John Kennedy. He currently serves as chairman of the Senate Committee on Health, Education, Labour and Pensions.

He ran for the presidency in 1980 but lost the Democratic nomination to President Jimmy Carter who failed in his attempt at a second White House term.

He helped win an increase in the national minimum wage this year and worked with Republicans to produce broad immigration reform, which failed in the Senate after stiff opposition from conservative Republicans.

Edward Moore Kennedy is the youngest of four sons and five daughters born to millionaire businessman Joseph Kennedy and his wife Rose.

His oldest brother, Joseph Jr, died as a World War 2 flier when his bomber exploded over the English Channel. John became America's first and so far only Roman Catholic president in 1960 and was assassinated in 1963. Robert was assassinated during his 1968 presidential campaign.

Reuters