His lead strategist says if McCain were to get 20 percent of these voters he will win. WASHINGTON - With the other party still waist-deep in its presidential nomination fight, John McCain, the presumptive GOP nominee, has been quietly courting the white working-class Democrats who have proved elusive for Barack Obama, his most likely rival in the fall. In the two weeks since Senator Obama's loss in Pennsylvania, Senator McCain has visited the struggling steel town of Youngstown, Ohio, to promote programs to retrain workers. He has gone to Allentown, Pa., to push a gas-tax holiday and argue that the...