New CNN poll

Results of the head-to-head matchup:

• Obama 49%
• McCain 46%

With other candidates:

• Obama 47%
• McCain 43%
• Nader 6%
• Barr 2%

Allahpundit says this is better than the McCain campaign had hoped, since they expect Obama to jump ahead by 10 points in coming weeks. As to the third-party showing, CNN says:

[I]ndependent candidate Ralph Nader and Republican-turned-Libertarian Bob Barr are both vying with the two major-party candidates for independent voters.
But at this point, it looks unlikely either will play a spoiler role: the margin between Obama and McCain is virtually unchanged, with the Illinois senator leading 47 to 43 percent. Nader pulls in 6 percent, and Barr 2.

Given that Nader has done almost no campaigning, it's likely that his showing is almost entirely a result of name recognition, rather than any deep left/independent (or pro-Hillary) animus toward Obama.

On the other hand, the CNN poll could be an indicator of how much work Barr's got to do in terms of his own name recognition. He's gotten an awful lot of "earned media" the past few weeks to be polling at just 2%.

Jim Geraghty of NRO from a McCain campaign briefing notes this:

Perhaps most ominously to those who would prefer a Republican presidential candidate who echoed talk radio on the issue, illegal immigration, [campaign manager Rick] Davis noted that McCain's history of stands on immigration that caused him such grief in the GOP primaries "may suit to fit him in a general election."

That Team McCain thinks their guy can ride the open borders agenda all the way to the White House shows how little attention they pay to the conservative base.