Democratic Rep. Jim Costa has declared victory in his race against Republican challenger Andy Vidak. New vote tallies from Fresno County put Costa 1,200 votes ahead of Vidak — Costa was losing to Vidak Tuesday by 145 votes — and his campaign believes his lead will continue to increase as the final absentee ballots are counted. “This has been a hard-fought campaign. It appears that it is now over. I believe our 1,200-vote margin will not only stand up, but will increase as the remaining few ballots are counted,” Costa said in a statement Wednesday evening.