[kiemo]

Its been said, but needs to be resaid. You arent protecting anything on the turn by doing a checkraise. If the previous streets aggressor was directly on your right and you were sure he would bet again, then go for the checkraise to protect.

Your action on the flop came from the MP position and by the time you checkraise you are only making 1 person out of the 4 call 2 cold to continue. The others now have at least 10-1 odds to call (by the time it get to CO again he could be getting 15-1 on his call, how is that protecting?), whereas they wouldve had as little as 5-1 odds if you just lead out.