 Faced with her first national crisis - the death of nine DEA agents in Latin America - Mackenzie shows strength and resolve in dealing with a corrupt leader. Meanwhile, Nathan Templeton is approached by an ambitious congressman who served with Mac s Vice Presidential candidate, Warren Keaton (Peter Coyote), and is eager to divulge potentially damaging info in an effort to derail his nomination. Mac s teenage twins resume public school, only this time it s complete with secret service detail and press spectacle, and while popular Horace welcomes the attention, shy Rebecca finds it overwhelming.