Because of the existence of the Union, Obama can safely ignore the White people in the South and Far West:
“Mr. Obama’s near-complete absence from more than 25 percent of the states, from which he is politically estranged, is no surprise, in that it reflects routine cost-benefit calculations of the modern presidency. But in a country splintered by partisanship and race, it may also have consequences.
America’s 21st-century politics, as underscored by the immigration debate now embroiling Congress, increasingly pits the preferences of a dwindling, Republican-leaning white majority against those of expanding, Democratic-leaning Hispanic and black minorities. Even some sympathetic observers fault Mr. Obama for not doing all he could to pull disparate elements of society closer. …”