Both images are by the same artist and even incorporate the same "OBEY-GIANT".
He ripped off the Obama pic from AP and the left one was blatantly stolen from the film They Live IIRC (OBEY)
(1988; from IMDB.com: “Nada, a down-on-his-luck construction worker, discovers a pair of special sunglasses. Wearing them, he is able to see the world as it really is: people being bombarded by media and government with messages like “Stay Asleep”, “No Imagination”, “Submit to Authority”. Even scarier is that he is able to see that some usually normal-looking people are in fact ugly aliens in charge of the massive campaign to keep humans subdued. “_