The latest example of Republican optimism about the special Senate election in Massachusetts is an unusual ad running in the Boston television market.

The ad features a candidate in next-door New Hampshire promoting the candidacy of Scott Brown, the GOP’s special election candidate in Massachusetts.

The $200,000 ad buy features two 30-second spots, one of which features Bill Binnie — GOP candidate for the Senate in New Hampshire — talking up the Senate candidacy of Brown, who faces voters Tuesday.

The commercials were paid for by Americans for Responsible Health Care, a new 527 organization formed by a friend of Binnie’s, according to a spokesperson.

Brown is vying with state Attorney General Martha Coakley (D) to fill the remainder of the term of the late Sen. Edward Kennedy (D).

The ads don’t identify Binnie as a Senate candidate.

Binnie, an investment banker, faces a crowded field for the GOP nomination in New Hampshire, including the party establishment favorite, former state Attorney General Kelly Ayotte, along with former state Board of Education President Ovide Lamontagne and businessman Jim Bender.

The Boston media market reaches New Hampshire voters.