THE LAST STOP IS COBURN: That's what colleagues are increasingly saying about staunchly conservative Sen. Tom Coburn (R.-Okla.), who now has holds on 95 different pieces of legislation for different reasons--a record for holds in the history of the institution, according to Associate Senate Historian Donald Ritchie. Coburn is so attentive to what he considers wasteful legislation and so adept at deploying Senate rules to bottle it up, observed a profile of Coburn in the Capitol Hill publication Politico, that "Senate aides on both sides of the aisle now take legislation directly to Coburn's office before moving forward to make sure he has no objections--whether he's on the relevant committee or not. If he does, they often swallow their pride and make the changes he's asking for." Holds by the Oklahoman range from big (breast cancer research) to small (the naming of a post office). Coburn's friend and fellow conservative, Sen. John Cornyn (R.-Tex.), said that the physician-senator will "take a shot at any piece of legislation, whether it's Democratic or Republican, if he feels like it deserves it. I think there is a sense he isn't going away, so we'll have to deal with him."