In alphabetical order, by last name:

Hilary Clinton: ASP, IIS

Ted Cruz: wordpress, nginx

Marco Rubio: wordpress, apache & nginx

Bernie Sanders: wordpress, nginx

Donald Trump: php, nginx

http://builtwith.com/hilaryclinton.com

http://builtwith.com/tedcruz.org

http://builtwith.com/marcorubio.com

http://builtwith.com/berniesanders.com

http://builtwith.com/donaldjtrump.com