The new margins look absolutely fantastic, but I think we want to do without the float. When the buttons and the date show up side-by-side, sometimes there's a fairly noticeable gap between the buttons and the bottom of the comment, and because it only occurs in some places, it looks more like a bug in the layout than a deliberate choice.

Here it is in the regular layout:
![comments_desktop](https://cloud.githubusercontent.com/assets/907055/2691561/3ed11260-c384-11e3-8659-d8f4fc3a960a.png)

And here in mobile:
![comments_mobile](https://cloud.githubusercontent.com/assets/907055/2691562/3ed1b526-c384-11e3-9e72-11745572ec1f.png)