Because he is smart. Releasing drip by drip keeps the issue opened. If he just released them all, they will be forgotten after few days. The press would discard them and here we go. Moreover, Democratic spinmasters do not know what else is coming their way, so denying something may become an idiotic lie the next day. This is a October surprise. That is how the game is played. I am glad that the Dems are getting taste of their own medicine.
Drip drip, Nov 3 comes and goes, drip drip. We want the m now the rest be dammed.