Washington (CNN) — Days after the worst mass shooting in the United States, the Supreme Court is poised to act on two cases highlighting the raging debate over what types of guns and ammunition may be banned and who should have the right to possess firearms. Justices will meet behind closed doors this week to determine whether or not to take up a constitutional challenge to a Connecticut ban of certain semi-automatic assault weapons and large capacity magazines. The court is also poised to rule by the end of the month on the case of a Maine man who says...