On HBO’s “Last Week Tonight,” John Oliver tackled an issue that many consider the most pressing threat to our democracy: gerrymandering. As he often does, Oliver explained the intricacies of this complex policy issue with wit and humor, much to the alarm of voters everywhere. After explaining how politicians help their own party win seats by “packing and cracking” voters into districts, Oliver left viewers with a glimmer of hope by introducing the idea of independent redistricting commissions.