Hillary and Bill are still together. Mark and Jenny aren't. Do you really believe the first has damaged his marriage more? LoL.
Uh...with all due respect, plenty of people think Hillary and Bill stayed together for different reasons, too. Not to say they don't still love each other. Jenny didn't care about political advantages to staying with her husband (even if there were advantages which there clearly weren't).
That means that Clinton's marriage is not based on love, which is more common than we think. But Jenny seemed to love Mark hahaha