A political attack on Kirkman puts privacy and transgender rights in the spotlight. Aaron weighs a major decision. Wells and Eli track a bioterrorist.

Aaron's heritage and a widespread teachers' strike become polarizing issues, and Wells discovers a sinister pattern in a flu outbreak.

On election day, Kirkman turns to his therapist to assuage his conscience about the events -- and his own decisions -- of the momentous prior 36 hours.