I'd start networking with a lot of like minded people on WordPress. Check out their blogs, leave helpful, constructive comments and you might see that they are interested in checking you out too.
That way you have a few people who you know are already interested in politic and who might be a good sample of readers to bounce ideas off.
In the end it's fairly simple: anyone might visit once, but ideally you you'd like them to keep coming back. How to achieve that? Content, good solid, interesting, well researched, insightful, content. The more the merrier.
and also... Rome wasn't built in a day, probably neither will your blog. Be patient and concentrate on writing very very very well for a small select group, if your group gets bigger then it's bonus. Either way, hang in there, it takes time :)
Have fun blogging!