Their focus is not without good reason.
Several scenarios can put the critical tipping point squarely on Colorado.
Make your own electoral prediction on this map from USA TODAY
The latest NBC/WSJ/Marist poll found a dead even race here, with Obama and Romney each earning 48 percent support.
Further evidence can be found in the latest figures on early and mail-in voting.
626,000 ballots had been cast in Colorado as of Friday and they break down like this:
-25% Unaffiliated / 3rd party
This cannot tell you who's winning the Presidential race in ballots cast so far, but it does hint at a key difference from 2008.
"It is a very strong indicator that this is going to be much closer than it was four years ago in which the Obama campaign just overwhelmed Republicans here 9 percentage points," said 9NEWS political analyst Floyd Ciruli.
There are two scenarios that would allow for a 269-269 tie in the electoral college.
Both scenarios require President Obama to win Colorado.
In this event, the U.S. House of Representatives would vote for President, with each state's delegation receiving one vote.
Most political watchers believe such a vote would put Romney in the White House, though it is worth noting that the vote would be held by the post-election House, not the current membership.
(KUSA-TV © 2012 Multimedia Holdings Corporation)