At least 88 politicians have been killed in Mexico since September

Some parts of the campaign trail in Mexico look like anywhere else -- rallies, bumper stickers, candidates making lofty promises. Other parts -- the threats, the assaults, the murders -- are more unique.

Political violence mars every election season here and the run up to the June 6 midterm elections has been no different. But this year has been particularly gruesome, even for a country more used to it than most. At least 88 politicians or candidates for office have been killed since last September, according to Mexican consulting firm Etellekt Consultores.