Anti-tax advocate Grover Norquist is showing up in yet another hot Republican primary Friday.

Norquist, president of Americans for Tax Reform (ATR), will appear with John Stephen, New Hampshire's former health and human services secretary, as the House candidate signs Norquist's "no-tax-increases" pledge. Stephen is challenging former Rep. Jeb Bradley for the GOP nomination. The winner will face freshman Rep. Carol Shea-Porter (D), who narrowly defeated Bradley in the Granite State's Republican-leaning Seacoast district.

Both Stephen and Bradley have signed the pledge, but Stephen signed four months earlier, in November 2007. Stephen, who pushed to cut his state department's costs, has tried to run to the right of Bradley, charging him with requesting an earmark when he served in Congress. Bradley has denied the claim.

Neither Norquist nor ATR has endorsed a candidate in the race, though the group's spokesman, John Kartch, said that ATR was "very impressed with Stephen's track record."

Norquist has taken an active role in other House races this year. He has campaigned against Reps. Wayne Gilchrest (R-Md.) and Walter Jones (R-N.C.), who had voted for Democratic bills that included tax increases. Gilchrest lost his primary in February though Jones won his on Tuesday.