Republican heavy hitters are stepping up for the party’s New York special election candidate, after a poll this week showed the GOP in danger of losing that House seat.On Friday, former House Speaker and Republican icon Newt Gingrich announced his endorsement of New York Assemblywoman Dede Scozzafava, who is trailing Democrat Bill Owens in a tight three-way race to succeed nine-term GOP Rep. John M. McHugh . McHugh vacated the seat to become secretary of the Army. The Republican National Committee also confirmed Friday that it was making a six-figure transfer to the National Republican Campaign Committee to help in...