Democrats are not holding Cain to any standard as far as the allegations being made against him. You are conflating criticizing him with setting a standard. The Democrats have set no standards when it comes to allegations of marital fidelity. They can't. They have too many instances of Democrats who have cheated on their spouses. The Republican party, however, espouses family values, which is why Democrats criticize Republicans who fall short of the very standards they themselves set.
And that is the reason you can't cite a single standard that Democrats hold Republicans up to that they don't keep themselves. I knew it. I suspect you know it too, you just can't bring yourself to admit it.
Also, let me know if you're capable of debating without hurling insults. I have no interest in calling anonymous people names. There is no bigger white flag of surrender.