Yesterday, 37 of the 100 Senators were elected. But what could have happened if all 100 seats were up for grabs in 2010?
Let's take a look at the House where all 435 members were elected. Republicans have a projected gain of more than 60 seats. This means Republicans gained almost 14%. Of the 37 contested seats in the Senate, Republicans gained 6 seats or 16%.
If all 100 Senate seats were contested and the Republicans made similar gains they would be +15 and in the majority. The only reason Harry Reid is still majority leader is because only 37 of the 100 seats were contested this year.