From ThaiRath, June 16, 2011
Left: The political party uses color to represent symbol of the party during the canvassing.
Middle: The Democrat uses blue, Pheu Thai uses red, and other parties’ [colors] makes me feel nauseated when taking a look at it.
Right: They change colors like a lizard.
At the bottom of the last frame: Doctor Somcharn from Ubonratchatanee [probably the person who came up with the idea for the joke]