Poll Mania

Somebody explain this:

IBD/TIPP Tracking Poll: Day Fifteen
Posted Monday, October 27, 2008

After seesawing between 3.2 and 3.9 points over the weekend, Obama's lead slipped to 2.8 Monday. Battleground also has Obama up 3, and other polls have tightened, including Rasmussen, Zogby and Gallup to 5. Some polls show swings in independents, but IBD/TIPP has them in a stable, 5-point range.

and this:

Barack Obama leads John McCain by a 52% to 36% margin in Pew’s latest nationwide survey of 1,325 registered voters.

Does anybody really know what's going on?

More analysis on the IBD poll here. Campaign Spot analyzes the Pew poll here.