The Maryland State Board of Elections web site has made excellent use of CSS and HTML to create a lightweight web design that is completely accessible. The total page weight for the home page is just over 7 kb and the stylesheet is a tad over 4 kb. That should serve them well during the election as their traffic spikes over the next day or so. Having such a small file size for the pages allows them to serve more people more quickly while conserving bandwidth.
I think the content of the site is pretty well designed as well, since it answered my question (what time do the polls open) very prominently on the home page.