Based on historical patterns, the next president is likely to be a GenXer. This is not good news for the many baby boomers running, or thinking about running, in 2016. When voters decide it is time to move the presidency on to the next generation, they keep electing presidents in that next generation, or they go on to the one that follows. They do not go back. Bill Clinton and George W. Bush were from the baby boomer generation. Barack Obama is from the Gen X generation (those born 1961 to 1981). If the pattern holds, the next president will...