This site is freakin’ great. it compiles polling data from every state to determine how close they are and then shows you where the election is at were it held today.
Keep in mind it doesn’t weigh polls, so some polls are certainly more reliable than others.
For instance, any poll that polls all potential voters than already registered voters is inherently less accurate. Any poll that doesn’t have a set of at least 500 is also inherently less reliable.
This site is simply a great way to monitor the current electoral situation, just always remember to take your polling data with a healthy dose of realism.
http://www.electoral-vote.com/