Thanks all for the helpful replies. I ended up making a custom taper jig for just this use out of two thickness of plywood.
The first picture below shows the jig that I cut on the bandsaw. It was a nice tight fit. I also made a test leg out of plywood that I tapered first. The picture also shows a finished walnut leg. When I tapered the walnut leg it was two inches longer (30"). I make it longer so that when I cut the mortise and fit the tenon, I don't split the top of the leg. Once I have the mortise and tenons done, I cut off the extra two inches as shown in this picture.
The second picture shows the test leg fitted into the jig. The third picture shows the test leg and jig on the table saw. In the fourth shot my Lovely Assistant keeps gentle pressure on the outfeed side to prevent the leg and jig from drifting away from the far end of the fence.
I made one mistake and had to remake one leg from scratch. I had the wrong side up when I started the taper. Since the mortises were already cut, I had to have the correct side up so I would have the mortises on the proper sides when the tapers were done. Well, wouldn't you know on the last leg I got the wrong side up and realized when I was half way through the cut. Dang!
After making a new leg, all four legs are now tapered and they came out fine. Glad I'm done with that, though.
Last edited by kjhart0133; 12-17-2012 at 07:23 PM.