"It just shows you how passionate [Kennedy] is about his profession and it shows to you what a dedicated person he is and how much he loves his country," Schwarzenegger said Sunday morning on ABC's This Week with George Stephanopoulos.
"When I heard that he went down there, it gave me goose bumps. It made me feel good, because I've known him for so many years and I know, you know, how passionate he is about all of this."
Schwarzenegger, who is related to Kennedy through marriage to wife Maria Shriver, said he called Kennedy on Saturday to congratulate him on casting the vote.
"He's sick and he's getting his cancer treatments, radiation and chemotherapy, and he's very vulnerable when you get those treatments," Schwarenegger said.
"And even with all those kind of obstacles and risks involved, he goes down to Washington, because they needed a vote, and he went there."