Today's polls

The latest from 538.com (that's shorthand for www.fivethirtyeight.com) shows a little tightening in McCain's favor, but McCain's improvement is based on unreliable polls -- and it's too little too late:

Today's Polls, 11/2: Afternoon Edition

Polls conducted since our update last evening suggest some tightening toward John McCain, but he sits well behind both nationwide and in many key battleground states and remains a long-shot to win the election.

The good news for McCain? SurveyUSA has become the latest pollster to show the race tightening in Pennslyvania, now giving Barack Obama a 7-point lead after he'd been in the mid-double digits at various points in October. The Muhlenberg/Morning Call tracker has also continued to tighten, also settling on that 7-point number.

SurveyUSA also has Virginia tightening a bit to 4 points. And McCain gained incrementally in the Research 2000, Gallup, and Diageo/Hotline trackers, although this comes after a couple of days when Obama had been moving up. (Rasmussen held steady, whereas Obama ticked up in Zogby).

Overall, our model shows McCain closing Obama's gap in the national popular vote to about 5.4 points. His win percentage has increased to 6.3 percent, from 3.8 percent last night.

However, several cautions about reading too much into these numbers:

Firstly, I have the model programmed to be EXTREMELY aggressive this time of year. There have been relatively few 'fresh' polls conducted within the past 24-48 hours -- most of these state polls were in the field late last week. As we get more data in today and tonight, the model could very well decide that the race is not tightening at all. Moreover, polling conducted on a weekend -- particularly on a quasi- holiday weekend -- is generally unreliable.

Secondly, even with this tightening, McCain remains well short the 2/2/2 condition that we defined last week:

John McCain polling within 2 points in 2 or more non-partisan polls (sorry, Strategic Vision) in at least 2 out of the 3 following states: Colorado, Virginia, Pennsylvania.

Indeed, McCain has not come within 2 points of Obama in any polls in any of these states.

Finally, where McCain has made progress, it has come mostly from undecided voters rather than Obama's support -- this is particularly the case in Pennsylvania. Therefore, he may be running out of persuadables to persuade.