According to NBC News, Biden became the nominee of the party following AOC’s speech.
Thank you @DemConvention for having me deliver Sen. Sanders' roll call nomination speech.
It’s been an absolute honor."

The tweet went on to clarify, “Ocasio-Cortez was asked by the DNC to second Sanders' nomination.
The nomination is a procedural requirement of the convention.
Ocasio-Cortez has previously endorsed Biden, & her speech was similar in length to other nominating speeches.”

The DNC shared the procedural purpose of my remarks to media WELL in advance.
@NBC knew what was going to happen & that it was routine.
How does a headline that malicious & misleading happen w/ that prior knowledge?"

AOC’s powerful movement on the other hand, just may be, and only time will tell.