WASHINGTON, July 28 - His problems remain many, and include the relentless violence in Iraq, the leak investigation that has ensnared some of his top aides and poll numbers that suggest substantial dissatisfaction with both his foreign and domestic policies. But President Bush has still had a pretty good July, showing how his own doggedness and a Republican majority in Congress have consistently allowed him to push his agenda forward even when the political winds are in his face. Yet there are limits to the message from this string of positive outcomes for the administration and its allies in Congress....