Former U.S. Secretary of State Hillary Rodham Clinton accepted the Democratic Party presidential nomination Thursday night, beginning a general election campaign as the first woman nominated for the office by a major party.

"Let's look to the future with courage and confidence," Clinton said. "And when we do, America will be greater than ever."

But her historic acceptance speech was also fraught with tension, as delegates supporting Clinton and Sen. Bernie Sanders (D-Vt.) broke into chanting wars on the convention floor.

Among the protesters: members of the Oregon delegation, who repeatedly attempted to walk out of Clinton's speech before leaving the Wells Fargo Center in the final minutes of her oratory.

Gregory McKelvey, a member of the Oregon delegation who stayed to the end of the speech, tells WW that 15 to 20 Oregon delegates eventually walked out. McKelvey posted video on Twitter of delegates trying to leave but blocked by convention security.

Oregon delegation attempting to walk out during Hillary speech but being stopped by SS #DNC

— Gregory McKelvey (@GregoryMcKelvey) July 29, 2016

Oregon delegates, many of them die-hard supporters of Sanders, have seethed all week—and at times interrupted the convention's pageantry with walkouts and chants. This morning, Sanders himself visited the Oregon delegates for a tearful breakfast at their hotel.

Clinton's speech, meanwhile, took direct aim at Republican nominee Donald J. Trump.

"A man you can bait with a tweet is not a man we can trust with nuclear weapons," Clinton said. "It comes down to what Donald Trump doesn't get: America is great because America is good."