Michelle Obamas closing speech

Please view Michelle Obama’s speech at the end of the Democratic National Convention’s Opening Night.

https://www.youtube.com/watch?v=uKy3iiWjhVI

What are your thoughts about the speech? Was it appropriate for the former First Lady to give a speech to support Vice President Biden? What made her speech appealing/unappealing? To which group(s) did she direct her speech? Which group(s) liked the speech? Why would these groups agree/disagree with her speech?