Senator Barack Obama, the Democratic presidential nominee, gave Denver another chapter in what could be his ‘history-making’ playbook, when a massive 100,000-plus Sunday crowd jammed the Civic Center, and spilled up the steps of the state Capitol.

Walking through the sea of supporters during a rally, Obama had behind him, a group that held 10-foot letters spelling out ‘CO4CHANGE’. The rally marked Obama’s third visit to Colorado since the Democratic National Convention in August - when Obama became the first black presidential nominee of the Democratic Party.

Commenting on the size of the crowd - the throng from the northwest corner of the park – Obama remarked: “Goodness gracious! Do you ever have small crowds in Denver?” Up in the polls and full of momentum, the Illinois Senator spoke before the enormous and energetic supporters quite like a coach going into the final quarter with a big lead.

Obama urged the voters to avail the opportunity of early voting. He said: “No point in waiting in lines if you don't have to. You know who you’re going to vote for.” Denver Mayor John Hickenlooper called Colorado one of the few states that can make a difference this election.

McCain spokesman, Tom Kise, while noting that Denver is a Democratic stronghold where Obama could expect large crowds, also said the McCain campaign is confident that on the Election Day, Colorado will be in the McCain column.

Comparing Obama’s rally to McCain’s recent trip in Durango, Kise said: “We went there, drew a line in the sand, and it was great. That’s a testament to the fact it’s going to be a competitive race.”