Around line 398 in stylesheet-BU.css you have

.centerColumn, #bannerOne, #bannerTwo, #bannerThree, #bannerFour, #bannerFive, #bannerSix {
padding: 0.8em;
text-align: center;
}

Remove .centerColumn

Is this stylesheet-BU. part of the template? .... or something you have added?

reason I ask is because ZC will load all stylesheets that are appropriately named XXXXXXXXXX.css .

I see a LOT of duplication in that stylesheet with stuff in the main stylesheet.css

If that BU stylesheet is an "experiment" css sheet, then rather name it to stylesheet-BU.BAK

BTW... if I was an American citizen I would probably vote for Obama. I lived in South Africa during the transition years, and voted for Mandela - and what a good decision that was!