Hi Blake,
I have two thoughts. First, to expand on what Lorinne said about the un-climbable pole. Those are what I have had the most luck with, (that and a
BB gun). I would suggest building a platform on top of a pole that is too high for
deer and too flimsy for bear. Put it far enough away from anything that squirrels and rats cannot jump to it. Then install a some kind of baffle. There are different styles, but I included a picture of one type.
My second thought is something that attaches to the bottom of a normal bird feeder (assuming those are already reasonably protected from non-bird guests). There are some style of feeders like Droll Yankee, who let you attach a "saucer" at the bottom. The one I had was not big, maybe 10 inches across, so only 3 or 4 inches on each side. But this caught the seeds from messy eaters, and I had cardinals, juncos, and morning doves all eating from it.
**Edit - PS I got the picture from amazon.com to satisfy any copyright stuff.
"The future is something which everyone reaches at the rate of sixty minutes an hour, whatever he does, whoever he is." C.S. Lewis
"When the whole world is running towards a cliff, he who is running in the opposite direction appears to have lost his mind." C.S. Lewis