The US Supreme Court has taken the lid off campaign spending limits. Super PAC’s can spend as much as they want to. The result is that almost $4 billion will have been spent on campaigns for the Senate and Congress by the time the voting is over. Some races aren’t even controlled by the candidates any more. The real players are big spending “outsiders, ”some of whom can contribute in secret. And it turns out that Democrats are so much a party of rich donors they’re sometimes beating Republicans at their own game. But, while everybody says they hate being inundated by TV spots, most voters learn what they know from political advertising.