For the past century, the agendas of the Democratic Party were predictable. They professed concern for working Americans and supported blue-collar unions. Unemployment insurance, a 40-hour work week, disability insurance and Social Security were their trademarks — often rapidly achieved by growing government bureaucracies and continually raising taxes. Still, many Democrats were socially conservative. By the 1970s, Democrats still deplored antisemitism. Party officials had rejected their own segregationists to champion civil rights. Presidents such as Franklin Roosevelt, Harry Truman, and John F. Kennedy all supported strong defense and military deterrence. All that is now passé. The only vestigial Democrat left in Congress is Pennsylvania Sen. John Fetterman, himself roundly despised by Democrat leaders. Today, supporting Israel and calling for campuses to stop their institutionalized antisemitism is Democratic political suicide. Forty years ago, any Democrat with a Nazi tattoo was political toast.…