At a joint rally on Tuesday morning in Portsmouth, New Hampshire called “Stronger Together,” Bernie Sanders endorsed Hillary Clinton for president, as expected.

The new show of political unity was not without moments of contention from the audience.

When New Hampshire Governor Maggie Hassan attempted to start a chant of “Hillary! Hillary!” during an introductory speech, chants of “Bernie! Bernie!” drowned out Clinton supporters.

A “Still Bernie” sign also took over the bottom half of a live CSPAN feed during an early portion of the proceedings, and those in attendance posted photos of a large crowd of Sanders supporters.

Yet the two leading presidential candidates strove to show a united front.

After walking onstage as the Bruce Springsteen song “We Take Care of Our Own” thundered over the speakers, Clinton and Sanders stood together behind the podium while Sanders delivered the first speech wherein he conceded that Clinton “won the Democratic nominating contest” and endorsed her candidacy for president.

An enormous cheer erupted from the crowd at Sanders’ endorsement, but not everyone in the audience was pleased: one reporter tweeted that around “30-40 Sanders supporters just walked out on Bernie endorsing Hillary in a single line in front of the press.”

Others applauded the endorsement. The grassroots group Progressive Change Campaign Committee released a statement arguing that “Bernie Sanders’ endorsement is the latest proof that the Democratic Party is increasingly unified around big, bold, progressive ideas—and that is good for Democrats in November.”

Sanders stated:

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