President Bush has long railed against leaks of classified information as a threat to national security; his administration is vigorously investigating unauthorized revelations of classified material to the press about secret overseas prisons and warrantless wiretapping. Now, a revelation of grand jury testimony establishes Bush himself as a player in White House efforts to discredit an Iraq war critic through the use of classified information.

The president is not accused of illegality. And no one questions his legal right to declassify information. But critics are now charging Mr. Bush with hypocrisy - a development that makes efforts to put his presidency back on track all the more daunting.

"Here's why this hurts: It reminds people again that the intelligence was bad and we're in Iraq without end for some of the wrong reasons, and that's at the heart of his 36 percent," says Larry Sabato, a professor of politics at the University of Virginia in Charlottesville, referring to Bush's job approval rating in recent polls.