It's one thing for a man to have sexual relationship with other women under your spouse's nose...
But it's another, much deeper levels of betrayal when a man impregnated his mistress, and deny that when said pregnancy is not obvious yet (I did not have sexual relations with that woman) but then when the baby is born, DNA test proved that Clinton is the father.
Fucking another women is forgiveable. Making and abandoning bastard child is another level.
Perhaps , but I doubt it would be enough. It would have had have been forcible rape or him murdering Lewinsky to cover it up for it to be raised to that level. You need 2/3 in the senate and you wouldn't get that under those circumstances.