I just think it's weird when people act like thinking maybe a millionaire elected official should step aside because of their inappropriate behavior/actions is somehow unfair to the person that did something wrong. Nobody's holding him to some kind of unrealistic standard here; it's actually really, really, REALLY easy to not do the things he did. It's being suggested that he resign; that's it. That is, let's face it, getting off pretty easy, and since he's an elected representative it's more than fair to ask for him to step down (or, at the very least, not run again) because his behavior is wrong for someone in that position.
And if you want to look at it from a strategic viewpoint, then the Democrats arguably missed a big chance for a big win even with him stepping down. He's from a Democratic state with a Democratic governor with a Democratic-favored election coming up in 2018 OR if a special election takes place. You know more and more of these stories are going to be coming out about elected officials, so you take the stand where you can easily take the hit and have him step down. Franken's nothing special as a legislator outside of having a quicker wit than most, so you you replace a Democrat with a Democrat (ideally a woman), do the right thing, and can actually take the high road and lead by example without it causing any real damage.
Franken doesn't need or deserve a break. What Moore did and refuses to do should be irrelevant in how Franken and his party respond to what he did.