Why is the corrupt demonrat house pushing for a 'clean' re-authorization of the garbage that is the current FISC/FISA debacle?

Because if it can be pushed through, then there is no reason for any further investigations into FISA and the criminals. It's been re-authorized without change and all other modifications will take place 'in house' and will surely be sufficient. No further investigations at all. Nothing to see here. Move along.