Facebook instant message of the day

I have a friend on FB that has limited English skills.  Today he sent this to me:

yes morning sir
sir i have one question ,,, what is the difference between comunist and liberal
if u can solve my question becasue i have little doubt
SIR PLZ IF POSSIBLE GIVE ME THE ANSWER

I smiled because I have conservative friends who would say, "No difference!"  Give me your answers and I'll reply to him later.