boston massachusetts senate president stan rosenberg take temporary leave absence husband face allegations use political connections sexually harass men rosenberg democrat step aside immediately remain away investigation senate say statement monday want ensure investigation fully independent credible anyone wish come forward feel confident retaliation rosenberg write last week rosenberg 68 say support investigation husband bryon hefner 30 plan enter inpatient treatment center alcohol dependency boston globe report four unnamed men say hefner grope make unwanted sexual contact newspaper say men ask remain anonymous fear speak powerful lawmaker spouse would endanger work political advocate reuters could confirm allegations newspaper say stem incidents 2015 2016. accusations late wave sexual assault sexual harassment claim levy powerful men u.s. politics entertainment journalism massachusetts senate president step aside husband face probe