From boasting about the size of his penis on national television to releasing records of his high testosterone levels, President Trump’s rhetoric and behavior exude machismo. His behavior also seems to have struck a chord with some male voters. See, for example, the “Donald Trump: Finally Someone With Balls” T-shirts common at Trump rallies.But our research suggests that Trump is not necessarily attracting male supporters who are as confidently masculine as the president presents himself to be. Instead, Trump appears to appeal more to men who are secretly insecure about their manhood. We call this the “fragile masculinity hypothesis.”
Basically this means that guys who are afraid they aren't manly men are attracted to phony tough politicians and aggressive rhetoric. Support for Ronald T. Dump is strongest in regions of the country where there are more Google searches for terms like "erectile dysfunction" and "penis enlargement." I could have predicted that.