A Doug Mastriano rally in Bucks County, Pennsylvania, featured praying and wading into culture wars.
National and state Republican donors and groups have offered little support to his candidacy.
"He's just been there the whole time," a Mastriano voter in Bucks County who only identified himself as Jeremy, told Insider.
"You can't get your message out one-on-one to voters," Josh Novotney, a Pennsylvania GOP strategist, told Insider.
"It's a different tactic and I pray it works," Joe Vichot, chairman of Lehigh County's GOP, told Insider.