[August 12th, 2014] Panel 2 is an homage to The Simpsons S6E05, “Sideshow Bob Roberts”. (I’m not a big enough nerd to know that offhand; I had to look it up). Transcription from the SNPP:

Barlow: Monty, I'm way ahead of you.  If you'll just open that door
         you'll see the next mayor of Springfield.
          [door opens to reveal a water cooler; everyone applauds]
          [the cooler bubbles]
Senator: What'd it say?