GIDDY WITH FAILURE, Democrats are breaking new ground in political strategy. Deep in a hole, they are digging still deeper. They have found a new method of dealing with setbacks: They find out what caused them, and do it again. Having unexpectedly lost four Senate seats in the 2002 midterms because of their obstruction and carping, they decided they hadn't attacked and obstructed enough. With a bare majority in the 107th Congress, they used a technical loophole to keep Bush's judges from reaching the floor of the Senate. In the 108th, with a bare minority, they are using a technical...