MT. LEBANON — Democrats claimed victory Tuesday after a two-month campaign for a vacant state Senate seat in politically divided suburban Pittsburgh.

Democrat Pam Iovino told her enthusiastic victory party at a union hall at Pittsburgh’s western edge that the district “is blue again” and worked her way through the crowd, hugging supporters.

With about 90 percent of precincts reporting before 10 p.m., Iovino led Republican D. Raja by 4,100 votes.

Raja called her to concede, a spokesman said. Iovino’s victory will not change the balance of power in the state Senate, where Republicans have a 26-21 majority.