These are tense times in Mexico, and cartoonists have sharpened their pens to portray the issues. The ruling Institutional Revolutionary Party, or PRI, is in turmoil over charges that former President Carlos Salinas de Gortari's brother, Raul, masterminded the assassination of party official Francisco Ruiz Massieu. Is the PRI mortally wounding Mexico, one cartoonist wonders? And shouldn't someone investigate the investigators? With the peso wobbling and the Chiapas conflict still simmering, Mexico appears to be walking a mighty prickly tightrope.