I see it as a number of causes...Democrats were waiting for the new President to fall flat on his face, especially considering his lack of experience in DC style politics...That didn't happen, and in fact he had a number of successes both domestic and foreign in spite of the stumbling blocks thrown in his path...They seized on their willing minions in the press to begin their slime-slinging campaign on him forgetting that he is accustomed to fighting in the mud given his swinish DNA...
They began their new campaign of suddenly remembered episodes of misbehavior and concocted stories of him or his appointees, thinking this would derail his agenda and force him into defensive mode...They overlooked the fact that he may be the most offensive President in history who took a page from Vince Lombardi's playbook, who probably took the same tactic from George Washington who said:
Washington, who is probably spinning in his grave over what the city that bears his name has degenerated into, likely got the idea from reading Sun Tzu, who wrote of the same philosophy in battle...Former Presidents, such as Obama and she-who-would-be-President, H. Clinton, cannot abide the idea of success rising from their failures, and have gone on the attack at full throttle, often to their own embarrassment...
Whether they will continue this direction until they burn out, or finally realize it's better to just wait until the political climate stabilizes before mounting a new campaign on what are sure to be some failings of Trump's own making remains to be seen...My guess is they'll stay on the attack hoping for a crack in the armor...
...Ben