Yep, I've heard of Ivory soap. Supposed to be the oil it's made with or something.
Here in Missouri, we catch a lot of channel cat with chicken liver, but there is a catch to it. We use rubber bands to hold the liver on the hook. Yep, rubber bands. We buy those packages of like 500 little pony tail rubber bands for $1.00 at Wal-Mart. Thread your liver on the treble hook like usual, then you take one of those little rubber bands and wrap it around the liver and hook shank two or three times before you cast. You can catch two, sometimes three cats off the same piece of liver that way. And it's a lot harder for smaller fish to steal your bait.
Channel cats here also eat shiners, so they make good bait. Grasshoppers are also good, but not as good as Cicadas. Nightcrawlers also work well, but it's a lot harder to keep other fish from taking the bait.
The one that surprises most people is marshmallows. That's right, I said marshmallows. You'd be surprised at how many catfish will hit a marshmallow. Seems they've got a sweet tooth, like a trout does.
Gale