NEW You can now listen to Fox News articles! A top Virginia Democrat’s support for his state's redistricting referendum ironically backfired after a judge he previously appointed helped torpedo his party’s bid to redraw the state’s congressional districts. Sen. Mark Warner, D-Va., who endorsed the referendum and appeared at pro-referendum events, gave $100,000 to the campaign behind Virginia Democrats’ redistricting effort, which voters approved in April . On Friday, a judge Warner appointed when he was governor in 2002, D. Arthur Kelsey, was among the four justices who voted to strike the referendum down on constitutional grounds. In fact, Judge Kelsey authored the 4-3 prevailing opinion. The voter-approved ballot measure was poised to give Democrats a major advantage heading into November's midterm elections, and they vastly outspent Republicans in their bid to get it passed.…