The Bivings Report has listed 10 tips of how to build a political campaign website. This is what the list says about blogs:
Don't blog unless you are going to embrace the spirit of blogging.
As the saying goes, write like you are sending an email to five close friends (not like a lawyer). Read other blogs. Link to other bloggers. Allow comments.
This link will let you view the list in full. It can be valuable to have the ten points in mind when designing your own campaign website or campaign blog.