Senate president to step down during investigation of husband's activities

The problem is that Rosenberg allowed his husband to meddle in State House business. That will be the focus of the investigation, and not the sexual assault.

Per the Globe article:

But, according to seven of the people interviewed for this story, including several of the alleged victims, any firewall that Rosenberg might have tried to build has not been successful. Those people have had conversations with Hefner in which he demonstrates a deep knowledge of the day-to-day workings of the Senate, one that goes well beyond what one might know about a spouse’s work. They say Hefner has followed up on their conversations with Rosenberg, and claimed to speak for the Senate president. They have seen him deal directly with legislative staffers on Senate matters. Their impressions are bolstered by Hefner’s own frequent claims that he is intimately involved in Rosenberg’s work.

Additionally, the Globe has reviewed messages written by Hefner that show his active involvement in the business of the Senate. They include direct communication with legislators and aides about Senate business, and exchanges in which Hefner orders around Rosenberg staffers.

How much he knew about it, we will find out. One would think he must've known, given that Byron was ordering his staff around and corresponding with legislators (never mind attending dinners where Senate business was being discussed). But if he allowed the outside factors to influence decisions in the State House, and did nothing to stop it, then he's guilty of much more than marrying the wrong dude.