[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/10/28/mccain1.jpg caption=" McCain's fight for Pennsylvania may not pay off."]
(CNN) - John McCain's campaign is banking its fortunes on a come-from-behind win in Pennsylvania, but a new CNN poll of polls of the Keystone state suggests the Arizona senator has made little progress there over the last week.
According to a statistical average of several recent Pennsylvania polls, Barack Obama holds a 10 point advantage over the Arizona senator, 52-42 percent. That's the same lead Obama held over McCain in a poll of polls of the state last week.
With traditional red states such as Virginia and Colorado looking increasingly out of reach for McCain, aides to the Arizona senator have all but said Pennsylvania's 21 electoral votes are a must-win to keep Republican hopes of a White House win alive. Both McCain and Palin have held several campaign events in the state over the last week as Election Day inches closer, and the campaign has continued to heavily advertise on television there, even as it pares back spending in other states.
Meanwhile, a new CNN poll of polls out of Florida - another must-win state for McCain - shows the race there remains essentially a dead heat. Obama holds a single point advantage there, and recent polls suggest the race is tightening slightly. A poll of polls of the state last week showed Obama ahead by 3 points.