IE9 mouse eventing issues

I've created a jsfiddle to demonstrate the issue at:
[http://jsfiddle.net/0fL37xem/6/](http://jsfiddle.net/0fL37xem/6/)

Notice that the tooltip is out of alignment and the click handler never fires for the graph on the right.

IE9 is having issues detecting mouse locations. It looks like the result from d3.mouse(svgElement) is returning bad x/y values.
After a little digging it looks like this might be related to a 2-year-old [D3 issue](https://github.com/mbostock/d3/issues/668) ?