The half-hour debate moderated by ABC11's Larry Stogner featured Paul Coble, George Holding, and Bill Randall.
All tried to demonstrate they're the most conservative choice for voters.
Holding, a former prosecutor, took aim at Coble's record on the Wake County Commission.
"Wake County debt has increased almost a 100 percent," said Holding. "I don't think those are conservative answers to problems."
But the candidates saved most of their attacks for President Obama and the Democrats. Randall - who ran against Democrat Brad Miller in the 4th District in 2010 - said Congress has to be more responsible about spending.
"Cut, cap and balance is an approach that I really believe is responsible. It will make real cuts and not just artificial cuts," said Randall.
Coble said he would target waste and discretionary spending.
"You can't cut everything, because there are some good programs, so you have to prioritize he explained. "You can't just take a chainsaw and cut everything."
The primary election is May 8. Click here to watch the entire debate or you can watch it broadcast on ABC11 Sunday April 19 at 11:30 a.m.