4
looks perfect to me...
couple of places you can adjust this.
>admin > blocks > polls > edit template and adjust the width there.
You could also look at the theme_blockleft.html in the theme folder - and see what settings are there.
You could also look at the style css and see if there is a setting there. - look at "outer", "odd", "even" and "footer" and make sure nothing wierd is set there.