what does "raining down obstacles upon them from the sky"mean?
To men who were accustomed to dealing with President Kennedy, it was like listening to a foreign tongue. Both in public and in private, Kennedy had been as direct as his pointed finger at televised press conferences. Johnson approached a strongly fortified position by outflanking it, or burrowing under it, or surprising the defenders from the rear, or raining down obstacles upon them from the sky, or starving them into submission. Rarely, and then only reluctantly, would he proceed directly from A to B. To him the shortest distance between two points was a tunnel.