While their husbands may be the ones in the Oval Office, first ladies have plenty of power of their own. In addition to playing hostess at one of the most famous residences in the world, America's first ladies have traditionally used their positions to shape policy, champion causes and help spark real change. Two months into her husband's presidency, though, first lady Melania Trump is signaling her role will be much more subdued. Though the first lady is viewed favorably by 52% of Americans — far higher than her husband's latest approval rating — Mrs. Trump has taken a hands-off...