FROM THEIR AL TO OUR AL Attention, presidential candidates: Is your campaign languishing? Dogged by a reputation for dullness? Then take a tip from Guatemala’s popular opposition leader, Alfonse Portillo. A former university professor, Portillo became a hero to voters last week after releasing campaign commercials crowing over having shot and killed two men in self-defense 17 years ago. In the civil war-torn country, that’s a badge of honor. But remember, don’t try this at home unless the statute of limitations has expired.