CSS/XHTML Problems

My website is here: http://www.savethegop.com and I am having a problem with my menu. I want it to bump up against the top of the header and then run down to the footer. Problem is two fold:

It seems to work in FF but when I change text size the menu moves up (if text smaller) or down (if text larger) and in IE 5,55,6 there are gaps betwween the menu bar and the header and footer. Any help would be great.

Also in my footer the link to WP is in white in FF but in the original link color in IE 5/55/6