113 politicians have been killed during this campaign season in Mexico

Gunmen shot and killed a mayor running for re-election in Mexico on Thursday, the second murder of a politician in a week after a candidate running for federal office was shot in the back of the head while taking a selfie with a supporter.

At least 113 politicians have been killed in the bloodiest election campaign in Mexico’s modern history, and the violence appears to be intensifying in the final weeks before the July 1 nationwide election.

Political assassinations have rocked the electoral season leading up to July 1, when voters will decide over 3,000 down-ballot . . .