I see what you mean. Given that you are using the Blogger widget, then there's no easy way to edit the HTML for that part of the blog, other than getting inside the CSS. I wouldn't advise you to do that, because it's easy to mess things up if you make a mistake.
Actually, I don't think the ads look so bad where they are. The left edge of the ads is lined up with the left edge of the About Me and similar boxes, which looks OK to me. I'd be inclined to leave it as it is. (But I'm not an expert in these matters.)