VIDEO: Money is the driving force in US politics -- even more so since a US Supreme Court ruling this year opened the door to unlimited spending by corporations and unions and given wealthy donors a cloak of anonymity. The midterm elections on Tuesday will cap the most expensive campaign period in US history -- with some estimating as much as 3.7 billion dollars will be poured into the races for Congress, governorships, local seats and on special ballot initiatives. AFPTV takes a look at Pennsylvania's close race for the US Senate. Duration: 01:59
