Would it be one of these? My flash is out of date so I can’t view them:
http://www.livingroomcandidate.org/commercials/1980
I will have to try from home later. I cant get it to play on the machine I am on now. I do recall that the part where Reagan said “they may not like us, but they will respect us” was him talking to the TV audience with a blue backdrop (maybe something on the backdrop as well).