Take over or start a NEWSPAPER. Seems to me that there ought to be some VERY cheap hardware and software out there. Make the news stright up, make the Ed and op ed pages utterly partizan conservative. Hold the senators up to editorial ridicule as often as humanly possible, but BE ACCURATE. Use their own voting records against them, Bill 123456 contains provison Y that.......and Sen. Jerkwater VOTED for THIS! Wrong as he/she can be!!! Sen Jerkwater REFUSES to meet with our reporter, Georgette Muckraker........we'd LIKE to ask him.......
A garage can be the location to start from. Get them FREE in grocery stores, etc. Ask for advertizers to defray costs. As there are plenty of unemployed out there, volunteer help might be easier to get than you think.
Download Sun Tzu's "ART OF WAR", read it several times model your campaign to include Sun's advice. Make it the SOP for the entire "staff" as time passes.
Remember, tough but honest, pay your spies well, attack the enemy at his weakest point.