As the debt limit battle drags on, my mind has gone back to the two previous instances in the postwar era when a Republican Congress was forced to square off against a Democratic president. The first was in 1947-1948, when Harry Truman was pitted against the 80th Congress. The second was 1995-1996 when Bill Clinton battled the 104th Congress.Looking carefully at these two periods, I think there are four lessons that House Republicans need to bear in mind as we enter the final phase of negotiati...