Pollster.com currently projects Obama to win 277 electoral votes to Romney's 206 with four states still too close to call - Florida, Virginia, Colorado and New Hampshire. My own projected map created with Pollster.com's do-it-yourself electoral map agrees with the Pollster.com, but I expect Colorado, New Hampshire and Virginia to be won by Obama. I still see Florida as too close to call.
The closing national polls show a closing tick to Obama, and as you can see on this Nate Silver post, almost all of the recent swing state polls are going Obama's way albeit narrowly.
Here is the Pollster.com current national polling average (I customized it to date from September 1 to present)
Let me finish with a note of caution. On election night it is likely when the vote count finishes for the evening, whether or not enough states have yet been decided to conclude the contest, it is likely Romney will lead in the national vote count. This is the message of TNR blogger Nate Cohn who says:
If Obama ultimately wins the popular vote by a narrow margin, as suggested by the current average of national polls, Obama won’t lead the popular vote on Election Night and might not for weeks.
With the West Coast providing the margin of victory for any Democratic candidate in a close election, Republican presidential candidates outperform their eventual share of the popular vote until the West Coast reports its results. In 2008, California, Washington, and Oregon voted for Obama by a 4 million-vote margin, representing nearly half of his national popular vote victory.
But the time zones are not alone in delaying results from Washington, Oregon, and California. In most eastern states, the overwhelming majority of votes are counted by the end of Election Night, since only a small share of absentee or overseas ballots arrive after the election. But elections in Washington and Oregon are now conducted entirely by mail and 41 percent of California voters voted by mail in 2008. In some states, ballots only need to be postmarked by Election Day and it can take days before all of the votes arrive and weeks before they get counted, usually in modest batches once or twice a day..On the results for Senate and House of Representatives I still see a Democratic Senate and Republican House. Although I am marginally more optimistic about potential Democratic gains in the latter the Republicans will retain a comfortable majority for the next two years.