Washington -- The Republican rebellion that President Bush smacked into with the Dubai ports deal was the tip of an iceberg of Republican discontent that is much deeper and more dangerous to the White House than a talk radio tempest over Arabs running U.S. ports. A Republican pushback on Capitol Hill and smoldering conservative dissatisfaction have already killed not just the ports deal but key elements of Bush's domestic agenda, and threaten GOP control of Congress if unhappy conservatives sit out the November midterm elections. The apostasy in some quarters runs to heretofore unthinkable depths. "If I had a choice...