Seeking an elusive middle ground, President Barack Obama is proposing a 2014 budget that embraces tax increases abhorred by Republicans as well as reductions, loathed by liberals, in the growth of Social Security and other benefit programs. The plan, if ever enacted, could touch almost all Americans. The rich would see tax increases, the poor and the elderly would get smaller annual increases in their benefits, and middle income taxpayers would slip into higher tax brackets despite Obama’s repeated vows not to add to the tax burden of the middle class. His proposed changes, once phased in, would mean a...