It is funny, but is it real or a photoshop?
I just did a quick set of searches and it appears that this is actually a fake. She never claimed Benjamin Franklin was president.
However, she DID claim that the Founding Fathers worked tireless to abolish slavery and that Carbon Dioxide is not a harmful gas because it is 'natural' and exists in 'nature'.
And of course, let's not forget that she famously said vaccines can cause mental retardation in children. To which, she responded to the person making the claim by exclaming: "Mom??!!"
Ok, I made up the last part.