A new front opened in the growing threats to Joe Biden’s presidency on Tuesday when the leftwing environmentalist Jill Stein formally launched her third presidential bid in an online conversation with two fellow progressive activists.
Stein, 73, who is bidding to become the US Green party’s nominee, is the latest in a series of mostly leftist figures to announce candidacies with the potential to erode Biden’s core support in an expected re-match against Donald Trump in next year’s poll.
