WASHINGTON -- When Ronald Reagan's former secretary of the navy, James Webb, eked out victory against the Republican Senator George Allen in Virginia, what did the Democrats gain? To be sure they gained control of the Senate. That has been widely noted. Less widely noted is the fact that they gained something infinitely more subtle, but delightfully more amusing as will become apparent in the months ahead. In Webb they gained yet another very unpleasant person as a conspicuous member of the party hierarchy. He will not be easily obscured. Webb now takes his place with Hillary Rodham Clinton, Dr....