Framing Sanders as a divisive party outsider who won’t accept defeat, the Biden campaign pointed to his bitter Democratic primary fight four years ago with his party nemesis, Hillary Clinton. That ended with a chaotic nominating convention and Donald Trump’s election months later.

Biden’s strategy capitalizes on Clinton’s successful effort to brand Sanders as more unlikable than Biden among women, who favored the former vice president by 12 percentage points during his 10-state romp Super Tuesday, according to exit poll averages. With the averages showing Sanders lost black voters by even more — 34 points — the Biden campaign also tangentially brought up race in bashing the Vermont senator.

“We can’t divide this party like we did last time to allow Trump to get reelected,” Biden campaign co-chairman Rep. Cedric Richmond, a member of the Congressional Black Caucus from Louisiana, told reporters on a conference call Wednesday.