Oh interesting... MapYourVote does support IE8 but not IE7.
IE8 has a "compatability mode" that essentially turns it back into IE7. My guess is you have this turned on by accident. Here is a web page I found that tells you how to turn it off
Just as a side note, I would suggest trying other browsers because IE8 is very slow relative to Firefox or Google Chrome. My guess is you will have a way better experience with all web sites using one of those. IE9 is much better but it only works on Windows 7. That is just a side note, for your informaiton type of thing.
Thanks for your feedback and be sure to let me know if you continue having problems!