Republican congressional hopefuls Keith Fimian and Pat Herrity furiously worked the phones, passed out fliers and dispatched surrogates to knock on doors Monday in a mad scramble to shore up votes — and donations — on the final day before the Tuesday primary.

Herrity, a Fairfax County supervisor, and Fimian, an Oakton businessman, are fighting for the right to square off against freshman Democratic Rep. Gerry Connolly to represent Virginia’s 11th Congressional District, which encompasses Fairfax and Prince William counties.