Elizabeth Warren undermined her own pitch that she’s the candidate who can fuse the Democratic Party’s two competing factions by going after Bernie Sanders.

Tensions between the two were palpable this week during the Iowa debate on Tuesday. When pressed by the moderators, the Vermont senator, 78, denied the Massachusetts Democrat’s claim he told her during a 2018 private meeting he didn’t believe a woman could win the White House. Warren, 70, turned the line of questioning into a quotable soundbite.