Xavier:  Mr Dalton writes: "When did white racism stop effecting public policy?"

You comment: "You meant "affecting" but I suppose I'm racist for pointing that out (assuming you are black as you claim to be)"

Here are the two definitions: 
"Affecting: affect - definition of affect in English | Oxford Dictionaries
https://en.oxforddictionaries.com/definition/affect
have an effect on; make a difference" 

"Effecting: - definition of effecting by "The Free Dictionary
www.thefreedictionary.com/effecting
Something brought about by a cause or agent; a result. 2. The power to produce an outcome or achieve a result: The government's action had little effect on the trade imbalance. 3. Advantage; avail: used her words to great effect in influencing the jury."

I think Mr. Dalton said exactly what he meant when used the word "effecting"...meaning "producing an outcome or achieving a result.  That's a much stronger term than "affecting"  meaning to have influence on a decision.  
cheap shot, XM