Just released poll of 1000 likely voters, polled October 18-21, puts Obama at 49, Romney at 46:
http://www.democracycorps.com/...
This poll has been included in RCP averages in previous months. A pretty stable trendline by this pollster, as Obama was +5 in early September, +2 in late August, and +4 in late July.
Here's a link to the detailed results:
http://www.democracycorps.com/...
For those who aren't familiar, this is Stan Greenberg's polling outfit.
UPDATE: For what it's worth, at this same point four years ago, this pollster had Obama up 4, 50-46.