I agree with Amy. It'll make clean up a lot easier on both of you. And you can stop worrying about it and stop giving him pressure. I played the power struggle game for way too long with my 2nd (my first boy) and finally put him back in diapers till he decided he was ready. He was past 3 1/2 when I did that, and a few months past 4 before he was potty trained (but when he was, it was 100% trained from nothing to everything within a week!). I did take away his favorite activity, because it was for big boys (and big boys go potty) but I didn't keep asking him to go potty, I just mentioned it when he asked for that activity.
You want to make sure that he feels okay pooping when he needs to (hence the diaper suggestion). Some kids hold it and hold it and end up getting constipated, then it hurts to go, then they're scared to go. That can really slow down potty training, and potentially cause a medical issue (impacted bowel would be no good!)
I know you are so ready to have him out of diapers. But try to be patient for a bit longer. Let him be ready too. I have yet to see a kid go to kindergarten in diapers, and I taught kindergarten :) Just make it easier and less stressful on both of you and he'll go when he's ready.
Oh- and going to the neighborhood co-op and seeing that other kids go poop in the potty can be the turning point for him to make that decision!