Deegan might be the most Republican-looking Democratic candidate I've ever seen.
You're right, and it's interesting. That being said (and, just as a fair warning, the rest of this post is barely related), Amanda Mull, the contemporary writer I trust the most by far to write honestly and perceptively about Southern culture, a few years ago
wrote a really good piece about the connotations of blonde hair in the South. None of them look quite like Donna Deegan, but there's a particular type of blonde look that white women in the South will often have even when they're Democrats. (Angie Craig might look like this if she were blonde.) I'm most familiar with the Atlanta area, where prominent Democratic politicians who look like this are Jen Jordan and Shea Roberts. My one friend from there who I really think could go into politics looks like that but younger. It might present as Republican but really it's just the look when you're from a town with two churches and you're with the Methodists, not the Baptists.