Politicians describe Social Security as "the third rail," meaning that enacting any benefit cuts will kill them politically. But this is precisely what they voted to do under the Bipartisan Budget Bill of 2015. The bill reduced the benefits of married couples and divorcees who were younger than 62 as of Jan. 2 by up to $60,000. Even $25,000 is a lot of money for most workers, given that the median household income is about $50,000. The new law prevents most people who reach age 66 from providing spousal benefits to their spouse or children while letting their own retirement...