Two men walk by two homes for sale in Palo Alto, Calif., Wednesday, May 7, 2008. An industry group said Wednesday that pending U.S. home sales dropped to a new low in March, signaling the housing slump has yet to bottom out even as the spring sell season gets under way. (AP Photo/Paul Sakuma) AP - Democrats' plans to help hundreds of thousands of homeowners struggling with rising subprime mortgage rates and plummeting house values could be sidetracked by President Bush's threatened veto and the backing of many congressional Republicans.