The rise of public support for the populist right, and in some cases also the populist left, has remodeled political competition in France, Germany, Italy, and Poland. British politics is increasingly following this trend, although a general election is not due until 2029. The right populist Reform UK party, led by veteran Brexiteer Nigel Farage, has been leading in opinion polls since April, clearly sapping the remaining strength of Britain’s venerable Conservative (Tory) Party. The unpopu...