Some attendees started leaving a Maryland gym as soon as the president began speaking.
The first lady stumped for Crist as he works to rally black voters.
After canceling events for Ebola, the president will resume campaigning on Sunday.
Scott said Crist’s use of the fan violated debate rules.
The president will focus on gubernatorial races in states he carried in 2008 and 2012.
The governor, who is in a tough election fight, said he wants jobs that paid much more.
Crist is a former Republican Florida governor turned Democrat.
Peter Schroeder 10/11/14 10:02 AM EDT
Republican Scott Walker and Dem Mary Burke disputed over abortion and voter rights.
Michelle Obama will campaign in Massachusetts, Wisconsin, Maine and Illinois.
The president and first lady will campaign for embattled Gov. Pat Quinn (D-Ill.) next month.