If Republicans will study the returns from Massachusetts, then review the returns from Virginia and New Jersey, light will fall upon the path to victory over Barack Obama in 2012. Obama defeated John McCain by winning the black vote 24 to 1, the Hispanic vote 2 to 1 and taking a larger share of the white vote, 44 percent, than did John Kerry or Al Gore. As the white vote was three-fourths of the national turnout, Obama coasted to victory. Now consider Massachusetts. In the 2008 election, no less than 79 percent of the voters were white, and Obama carried...