One of the interesting dynamics occurring in the Nevada Senate race right now is that Harry Reid is outrunning his approval numbers- about 10% of voters who don't approve of his job performance are planning to vote for him anyway.
The automatic assumption would be that those are folks who think Sharron Angle's too conservative, but only 40% of them actually hold that opinion. When you ask them whether Reid or Angle would be more effective as a Senator though 87% of them say Reid to only 10% for Angle.
Reid's power in Washington and ability to deliver for Nevada wouldn't really make that big of a difference if this race was in the 5-10 point range in either direction. There aren't that many voters who are going to let that trump party and ideology. But in a race that is basically 50-50 right now voters who don't like Reid but are voting for him anyway because of his effectiveness are tipping the scales. It's the kind of thing that could end up making the difference in a race that's not likely to be too slanted in one direction or another.
Overall 48% of Nevada voters think Reid would be more effective to 42% who say Angle.