Floating bait (not lures that float)

I was reading the Sun-Times fishing report and Dale Bowman mentioned one of the guys he was fishing with for cats was using chicken livers on a swivel and leader and floating the livers down the current instead of using a weight or bobber? Anyone have any luck doing this? I've had real good luck this year with catfish using a slipshot or other type of weighted setup, but just wondering if I should add this to the arsenal if I do run into some bad luck.