Polls, while detested by those who don't fare well in them, are pretty useful regardless of what side of the aisle you're standing in.
Take the case of Sen. Harry Reid, who has a significant amount of power because of his leadership position. However, his poll numbers are in the dumps and it's very conceivable he could get the boot.
How does Reid feel about it? Pretty nonchalant. He quips in the above linked story about how his poll numbers don't reflect doom and gloom.
Reid is taking a flawed page out of the books of George W. Bush and Karl Rove. Remember before the 2006 midterm elections, when Bush scoffed at poll numbers? He quipped that Democrats were already taking measurements for the drapes there were going to hang once in power.
Or Rove, who spoke down to an NPR personality (yeah, I would, too) when presented with polls showing Republicans doing poorly. What did Rove do? He might as well have called the NPR guy a fool. Why, NPR was looking at a measly three polls a day. The mighty Rove examined tens of such polls, so his understanding of the situation was far clearer.
Yeah. How well did that work out? Take note, Reid, and keep raising money. You're going to need it.