Watergate started out as partisan, but in the end Democrats and Republicans alike forced Nixon from office. Indeed, a group of senior Republicans led by Howard Baker and other party luminaries went to the White House in August 1974 and pressed the President to step down.
That's the difference between Republicans and Democrats. You'll find some Republicans with with qualities of leadership and integrity. Not so on the Democrat side of the aisle. Jesse Jackson, Jr is a prime example. With his medical and legal problems Democrat leaders in both Illinois and the US House should have dropped him from the ballot and replaced him with someone else. He was not fit to serve and it was unlikely he would ever serve his entire term. They didn't, even though whoever they replaced him with would probably have won. Now they have to have another election for no good reason.
There is nothing Obama or any Democrat president could ever possibly do that would have Democrat leaders try to talk him into resigning or support his impeachment no matter how much it was warranted.