There are a couple of ways to get the true Moto circles widget. The main limitation is that it will only run on the new Moto launcher. Both methods require root.
1) Install the Razr M launcher, Circles widget, weather widget, and other optional apps from the Razr M. Link
here. (Instructions are for the Razr, but I have tested them on my Bionic and they work fine. Some apps are named slightly different but it's easy to figure out.)
2) Install the custom ROM Icarus HD. Link
here. Requires Safestrap. I have not personally tried this one but lots of Bionic users on that forum are running it.