Upstart Dave Brat beat heavily favored incumbent Eric Cantor . The race was a rematch of the 2010 special election Challenger 's main argument was that Cantor had turned his back on conservative principles .
Upstart Dave Brat beat heavily favored incumbent Eric Cantor . Brat raised less than $ 300,000 compared to Cantor 's $ 5 million . Challenger 's main argument was that Cantor had turned his back on conservative principles .