President Barack Obama should lead a forceful drive to revive the Voting Rights Act, which was effectively disemboweled by the Supreme Court’s decision last week. All celebrate the 1965 Act as the most consequential civil rights legislation of the past century. Its passage was central to the building of the New South, opening the way to attracting foreign investment in auto factories, creating CNN, hosting the Super Bowl, even electing presidents. One afflicted with a poisoned heart is often blind to its effects. The South learned only after the civil rights legislation that segregation was blighting its own potential. In …