That is strange and I can’t figure out why that is happening. I’ve tagged this thread to have it moved to the themes forum where hopefully one of the theme team will see it and figure out what is happening. It appears to happen anywhere there is a block of text.
I did some investigation, and the issue is caused by the Polldaddy poll inside this post: http://ssacsun.net/2011/10/18/555/ . The poll code is adding a large left margin on the poll, which is causing the empty space on the left.
I’ve informed our team about this, and as soon as we have a fix, I’ll let you know.
I was able to reproduce this issue on another blog. It appears to be an issue with the poll when used in a sidebar with Mystique’s right-to-left stylesheet. We are looking into a fix and will post back here when one is found.