GEORGE W. BUSH must soon decide whether to reverse the biggest economic blunder of his Presidency by ending his three-year imposition of steel tariffs halfway through that period. The issue that bitterly divided the administration when President Bush wandered down the protectionist path 18 months ago now has his entire economic team united in advocating a change. But high-level sources insist no discussions have been held, and the President has not signaled his intentions. Even Commerce Secretary Donald Evans, a leader in imposing tariffs, is reported by colleagues to support change. Seldom has a President’s initiative backfired so completely as...