Senator Feingold introduced the bill, and the two other co-sponsors are Barbara Boxer and Tom Harkin.
Kerry's office declined to issue a statement about why he chose to sign on now.
But in a post at dailykos.com on Thursday, Kerry gave some indication:
"Enough is enough. Yes, Congress needs to end the days of roll-over and rubber stamp. . . . But something far more fundamental is out of whack in Washington. Every day we learn something new about this Administration's attitude - and too many people greet each story with a yawn as we learn that President Bush has announced he can disobey more than 750 laws enacted on his watch. Since when do we accept that any President has the power to set aside statutes passed by Congress when it conflicts with his interpretation of the Constitution? We're dealing with a group of people who believe our traditional values are a luxury we can no longer afford.