I care that he lied about it. I care if he tried to get his staffers to cover it up. And I care if he can't fulfill his duties b/c he "needs to grow as a husband and man".
I know it may not matter to most, but the trends of "there's no right and wrong, and no accountability for actions as long as it makes you feel good" make me sick. If he wants to tweet pictures of his dong, more power to him. Then he can either stand up in front of people and say "hell yeah, I tweet pictures of my dong! Who the hell cares? It doesn't affect my job!" and take whatever consequences come from that, whether it's "nothing" or "your constituents are voting you out next election". If someone wants to cheat on his wife with a dude, that's between you and your partners. But if your co-workers make you resign, then you have no one to blame but yourself.
No one's perfect, and I'm certainly not. But there are standards of conduct that are required for any leadership position. And if you want the position, you have to fulfill them. We've talked about this over teachers at Christian schools and military officers making stupid videos and pastors leaving churches, but now that it's a member of Congress, who cares? Well, as someone whose promotions are reviewed by Congress, I do.