Both campaigns are stressing that possibility. Here’s the Obama campaign:

In a phone interview with FOX News, Barack Obama’s deputy campaign manager, Steve Hildebrand said: “John McCain is right. Things are tightening in the battleground states.” FOX News obtained a copy of a memo Hildebrand sent to long-standing Democratic operatives on Tuesday. The memo, shown below, reveals the extensive get-out-the-vote efforts Obama’s team has underway and “urgent” needs that have yet to be met. Hildebrand told FOX News he sent the memo out to boost efforts in Florida but that similar memos were also sent out seeking help in North Carolina, Georgia and Ohio. He said needs were less acute in Pennsylvania. Hildebrand said the campaign disregards current state polls showing Obama ahead. “They were not always a good indicator in the primaries so we’re working hard now. We feel good but we always need more help in the field. On the ground in these states, things feel like they are tightening.”

I guess that’s the reason for this video:Pretty good video, eh? Kind of reminds me of the victory lap that Obama’s been taking lately.And this from the McCain campaign:

We have merged all of our interviews over the last three plus weeks to identify undecided and respondents who “refuse to respond” on the ballot question. This can be as high as one out of ten voters, but is generally about eight percent (8%) of the electorate in battleground states. These voters might generally be non-voters in most cycles. But, in this cycle, 61% describe their interest in the election as a 10. This is higher than the last track among ALL voters in 1996 and 2000. These voters are older, downscale, more rural, and are certainly economically stressed. They are quite negative about the direction of country and seek change. They voted for Bush over Kerry by a margin of 47% to 24% and this partisan advantage is a critical element to understanding our capacity to “get” these voters. They have significant hesitations about Senator Obama’s experience and judgment. Given an Obama TV media barrage we have not witnessed since the last candidate to run without public financing, Richard Nixon in 1972, and the daily drumbeat about Obama’s chances, given their demographics, it is my sense these voters WILL vote in this election and WILL break decisively in our direction. These undecided/refuse to respond voters breaking decisively against Senator Obama mirrors the pattern of the last two months of the Democrat primary season. When they do break, I believe they will add a net three plus points to our margins.

So, don’t start dancing yet, you haven’t made it to the end zone.