Ovide Lamontagne, a former GOP gubernatorial nominee in New Hampshire, is filing Monday to enter the 2010 Senate race, adding to an already crowded GOP primary in the Granite State. “I believe that I can build a coalition that not only can win in the primary but in the general election,— Lamontagne said in a phone interview on Monday. Lamontagne has been exploring a bid for the last couple of months, headlining events in both Washington, D.C., and New Hampshire. National Republicans recruited former state Attorney General Kelly Ayotte to get into the race after polls showed this summer that she led likely Democratic nominee Rep. Paul Hodes. Two other GOP businessmen with personal financial resources to fund their own campaign, William Binnie and Jim Bender, have also filed to run for the open seat. Republican National Committeeman Sean Mahoney is considering a bid as well.Despite the crowded field, the 1996 gubernatorial nominee was confident that he would have the means to wage a strong campaign. “I’ve run before, I’ve raised substantial amount of money before — at least by New Hampshire standards — and I believe I’ll be able to raise the amount of money necessary to wage a campaign,— he said.