Republican Thomas H. Cross III has conceded the Illinois treasurer’s race to Democrat Mike Frerichs. Cross released a statement today saying he called and congratulated Frerichs, a state senator from Champaign. The hard-fought race had as few as 400 votes separating the candidates early this week. Local election jurisdictions finished counting late-arriving mail-in and provisional ballots Tuesday, two weeks after the Nov. 4 election. Cross, a lawyer at Mahoney, Silverman & Cross LLC in Joliet, is the …