Democratic state representatives in Minnesota staged an overnight sit-in in their house chamber on Thursday after the Republican speaker failed to put a gun violence prevention bill up for a vote. Samantha Sencer-Mura, a Democratic representative from Minneapolis , first announced the plan on Wednesday from the floor of the state’s house of representatives, giving speaker Lisa Demuth, a candidate for governor, 24 hours to give the bill a vote before the sit-in would start. The Minnesota senate, controlled by Democrats, narrowly passed the gun violence prevention omnibus earlier this month . The house, where there is a 67-67 vote tie and a Republican speaker in charge, has so far not taken up the bill. The push for new gun laws came after a school shooting at Annunciation Catholic church last August, where two students were killed and others injured during a school-wide mass.…