Lieutenant Governor Kim Driscoll and Republican lieutenant governor nominee Shawn Oliver used their only in-person debate Tuesday to defend their running mates and their own records on abortion, immigration and dealings with the Trump administration. The half-hour debate featured neither Gov. Maura Healey, a Democrat seeking another term, nor Republican gubernatorial nominee Michael Minogue. But the campaigns they lead were central to the exchange, moderated by Jim Braude and Margery Eagan. One key issue was a possible 2028 ballot referendum that anti-abortion activists are pursuing to repeal a law Healey signed in August. The law makes it easier for women to obtain abortions later in pregnancy. Oliver faced questions about whether he would support the proposed measure. Driscoll is seeking a second term alongside Healey. Oliver is running with Minogue, whose campaign ticket changed after Oliver’s former running mate, Brian Shortsleeve, appeared with him in July. The debate put two lieutenant governor candidates in the position of making the case for their parties’ gubernatorial nominees, while also drawing attention to questions that could shape voters’ choices on reproductive rights and the state’s relationship with the Trump administration.