As someone who has spent almost his entire life in Massachusetts,other than 4 years in the military,i can second the finding that there are almost no Obama stickers to be seen here.
I’ve seen the Obama’12 stickers - mostly on Prius’ and Subaru’s - not as many as in ‘08 though....I think I’ve seen maybe 2 Romney stickers (Drive around 1,000 per week all over the North East)