I use the approach mentioned here - polite, clean, responsible, and ready to take "No" for an answer. I'm in Mass., the hotbed of the anti's, so it's a bit of a challenge. One woman denied me, saying she was "awfully fond of my deer." I declined to point out that, in fact, the deer belonged to the Commonwealth, not the landowner. I offer venison to those who give permission. Those that want it get generous portions along with several printed recipes and a good bottle of wine.