Big money in politics buys television ads. Television ads are not very effective in Presidential races. Or, to be more precise, television ads are really only useful defensively in races where most voters already have opinions. Supporters lose confidence if they do not see their candidate's ads. Very few people are actually persuaded one way or another by an ad campaign. Once voters makes up their mind about who they plan to vote for, not much can change. Nothing is more powerful than a made-up mind.
It's important to remember this after the Citizen's United decision. Billionaires come and go and the money washes around the system, but I know that my vote cannot be bought. Most people's votes cannot be bought. And as the issues and interests become more clear, more votes are unbuyable.
As religious liberals, our message to our fellow citizens is: get a hold of yourself. Sort out your interests and principles and values, and figure how to advance them through your votes. That is your empowerment.