I write about politics - but I don't much write about CURRENT politics.
News type hubs are practically worthless so far as adsense earnings are concerned. You would seriously have to be the BEST of the BEST to make it on HP or any open publishing or blog site writing about current politics.
Now, you shouldn't go thinking that I make tons of money here - or that I write a lot of straight up politics hubs. . . .but I do some political hubs. . . .but I go after a broad, very broad spectrum of things so that my political hubs aren't irrelevant six months or six days after publication.
I think that the only way to make decent revenue from political hubs or articles is to include a LOT of good research and historical data in each one - that way you've got lots of keywords that are relevant to searches and searchers that aren't specifically looking for your exact content.
I'm not sure if that made good sense, or any sense - but I tried.