Gallup showing a dead heat in swing states
Gallup has been polling Obama and Romney head to head in 12 potential swing states. Their poll in March showed a big lead for the President, but as Romney has become the presumptive nominee (yes, Paul has picked up some delegates, but not enough yet to prevent Romney from getting the nomination), that lead has narrowed. Among voters who are certain they will vote for one candidate or the other, Obama has a 4 point lead.
A poll from George Washington University for Politico also shows a dead heat in the battleground states that will determine who the next President will be.
As discussed previously, Romney has a small margin for error, and a lot of money will be spent in states like Ohio and Virginia, not to mention some of the states out West.