A big part of this problem is the media's incessant harping on Republicans' moral shortcomings, while sweeping those of the Dems under the rug.
Perception is everything, and the Dems have powerful allies in the media to create a one-sided picture.
If we want to have an image of higher standards, we need to live up to those standards, including policing our own, because any shortcomings on our side will be trumpeted to the heavens.
I guess, also, that nobody really EXPECTS the
Dems to live up to high standards of ethics or morality.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus