This guy has done an admirable job of appropriating the visual style of Scott Hansen, of iso50.net / Tycho, who has been making design in a similar vein for many years.
Here are two designs I was immediately reminded of; both because of the style and, for these two in particular, the subject matter.
http://www.merchline.com/iso50/productdisplay.3969.p.htm / http://www.merchline.com/iso50/categorydisplay.2586.c.htm
I enjoy Scott's work and have purchased a few of his posters. This one is my favorites:
http://blog.iso50.com/wp-content/uploads/2008/12/iso50-north...
Even further back in the aesthetic pedigree of this work you'll note similarities to the work of Shepard Fairey, who created the OBEY giant phenomenon and, more recently, the iconic, 3-color HOPE poster for Obama's presidential campaign.