Ms. Duckworth was regarded by Biden advisers as among the candidates likeliest to help him achieve a smashing electoral victory in November. But legal advisers to the campaign expressed urgent concern that Ms. Duckworth could face challenges to her nomination in court: She was born overseas, to an American father and a Thai mother. While Mr. Biden’s team believed Ms. Duckworth was eligible for national office, campaign lawyers feared that it would take just one partisan judge in one swing state to throw the whole Democratic ticket off the ballot.
Derek Muller comments.