The violence has been spilling across the border for a long time and it is only getting worse. Imagine living in the midst of it...
The killing of Rodolfo Torre, who was seen as a shoo-in for governor in Tamaulipas, represents an escalation of the drug traffickers' war against the Mexican state.
"This is an attack not only against one citizen, but against all society; an attack not just on one politician, but against all politicians and our political institutions," Mr. Calderón said in a televised address.
Mr. Torre, of the Institutional Revolutionary Party (PRI), which governed Mexico until 2000, and at least three others were killed when his campaign convoy was ambushed by gunmen on a rural highway in Tamaulipas state.
The candidate, his chief of staff, campaign chief and at least one bodyguard died, officials said. Televised images showed several bodies, covered in white sheets, laid out on the pavement near the candidate's convoy of bullet-riddled SUV's. Mr. Torre and the others are believed to have fled their cars during the attack, but didn't get far.
Mr. Torre, a 46-year-old former doctor and father of three, was leading opinion polls by an average of 20 percentage points for elections on July 4. Twelve of Mexico's 30 states are due to elect new governors and mayors on Sunday.
Although lower-level politicians have been killed by drug gangs, the killing of a gubernatorial candidate is a sign that cartels are increasingly willing to fight back against the government.
Our Lady of Guadalupe, pray for Mexico!