Authorities on Monday were investigating why the driver of an SUV hurtled through a barricade and slammed into a Christmas parade in suburban Waukesha on Sunday, killing at least five people and injuring more than 40. Angelito Tenorio, who is running as a Democrat to be Wisconsin state treasurer, marched in the parade and witnessed the deadly incident. He wrote of the ordeal for USA TODAY Opinion. Tap the link in bio to read more. #waukesha #waukeshawisconsin