Combination of things

All going back to Obama getting elected. People were crying how he wasn't born in the US and he's muslim and a terrorist
Possibly 9/11 as well.
Fox news
Republican rhetoric.
The spread of social media, giving any moron that's breathing a voice.
Being emboldened by fox, republicans, and candidates.
All of these things have brought the cave dwellers out of their hibernation, to spout emotions, from fear to anger, instead of Intelligence and fact checking. MSM just giving these people their 15 seconds of air time, validates it for all those who feel the same, despite how wrong, immoral, and asanine it is.



That's what I think anyway