A senior Democratic adviser said yesterday he is disappointed and dismayed by the efforts of House and Senate Democrats to change administration policies in Iraq, predicting they would lead to further division and stalemate in Congress on the war. "If you stand back, the whole debate has been pretty frustrating. The bigger problem is that [Democratic leaders'] proposals are not going anywhere, such as some revised authority for the war," said Leon Panetta, a key Democratic member of the Iraq Study Group whose proposals to stabilize Iraq were largely dismissed by President Bush. "But those efforts are doomed. Either they...