#985: Percentage Points explain

[Cueball is sitting in an armchair watching TV while listening to a news report coming from the TV as shown by a zigzag line.]

Voice from TV: Senator Grayton’s campaign has imploded following the candidate’s promise to give tax breaks to drunk drivers and to authorize the use of unmanned Predator drones in the War On Christmas. Grayton had been polling at 20%, but his support has since plunged by 19%.

[Caption below the panel:]

I hate the ambiguity created when people don’t distinguish between percentages and percentage points.