Some Democratic observers fear their party is following the British left’s road to defeat

British politics rarely intrudes into a US presidential election. In 1988, Joe Biden was forced to abandon his first bid for the White House after it emerged that he had quoted without attribution a chunk of oratory from the then Labour party leader, Neil Kinnock. In 2016, Donald Trump deployed Nigel Farage as an occasional mascot on the stump, the Brexit victory in that year’s referendum deemed a happy omen that populists could defy the odds and win. In 2020, a third name has surfaced, offered as a cautionary tale to a Democratic party that this week confirmed a septuagenarian radical socialist and longtime backbench rebel as its frontrunner. That name is Jeremy Corbyn.

“I don’t want the Democratic party of the United States to be the Labour party of the United Kingdom,” James Carville, the victorious manager of Bill Clinton’s 1992 campaign, told audiences on cable TV and in New Hampshire this week, warning that if Democrats nominate Bernie Sanders, they will almost certainly be following Corbyn’s Labour party to defeat.