Number 1: antist8
Bumper stickers are: Join the Ron Paul REVolution, a charming white lettering on black background "__ the President" sticker (not W.), an anarchy symbol, and a darwin fish.
The second one is IRNMN78 , not sure if that is the year of the first competition or year of birth. I'm leaning toward year of birth. Plate frame: Triathlete, Bike, Swim, Run.
(I was stopped when these pictures were taken. Note the brake lights in the subject vehicles. Safety first.)