Forty-seven of the 100 seats in the US Senate are controlled by Republicans. Forecasts had the GOP rated as likely to take the Senate in November, but that's changed recently. In Massachusetts a celebrity economics professor takes on the incumbent Republican who sits in Ted Kennedy's old seat. In Indiana a Republican brags about his disdain for bipartisanship. In Virginia two former governors who at times have been mentioned as possible presidents square off. In Wisconsin a former governor and cabinet secretary faces a woman, who if elected, would be the first openly gay senator. We take on some of the more notable, hard-fought and surprising Senate races.