Sen. John Kerry, Massachusetts' other senator, who was at the hospital with Kennedy and other members of his family, released a statement saying, "Ted Kennedy is beloved and respected on both sides of the aisle in the Senate, in which he's been a giant for close to half a century, a legend in Massachusetts, and a dear friend to me and [Kerry's wife] Teresa.
"He's also been a fighter who has overcome adversity again and again with courage, grit and determination," Kerry's statement said. "Teresa and I are praying for Teddy, Vicki and all of his family, and 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 Associated Press and ABC News' Dean Schabner, Eloise Harper, Bret Hovell, George Stephanopoulos and Sunlen Miller contributed to this report.