Abuse Of Power: Threats by Senate Democrats to subpoena White House officials go far beyond politics. Nothing less than the constitutional wall dividing legislative and executive powers is at stake. President Bush is confronted with a responsibility in which not just his own White House is at risk, but the operational abilities of the institution of the presidency itself. Senate Judiciary Committee Chairman Patrick Leahy is threatening to subpoena White House officials such as presidential adviser Karl Rove and former White House counsel Harriet Miers over the ouster of eight U.S. attorneys in December. President Bush says he'll let them...