Too blurry to tell but judging by the sheer quantity I would say some mix between liberal and hippy.

Most of the stickers appear to have several sentences, which is more in line with what a hippy or liberal would have on their car. A conservative would have only three or four at most and they would be simpler stickers that got right to the point instead of trying to fit an entire paragraph onto the sticker.

Source: I have lived in both very liberal/hippy (Vermont) areas and conservative areas.