I think that what Morgan Freeman is pointing out is that Pres. Obama's black
ancestors didn't arrive in the US during the slave era (pre-1865, therefore,he's not quite "one of us".
This is some of AAs dirty laundry that we usually don't talk about
: why are the children of African and West Indian immigrants surpassing other AAs.
PBS's series,Black Journal,did a program way back in the 70's or 80's comparing the median family incomes of different ethnicities. The national average was given a value of 100%.
On said program,it was revealed that Irish American families scored a value of 104% of the national median income,West Indian descendants,80-something %,other AAs and NAs were at 60-62%,and Jews were at 180%.
This probably has something to do with attitude. I believe that when the grandchildren went back to visit Africa or the West Indies,they saw blacks
and mulattos doing all sorts of jobs and likely didn't grow up with the attitude that "I can't do this because I'm black!"
I'm an AA and NA history buff.