ABC News' Shushannah Walshe and Emily Friedman report:
MORRISON, Colo.-In front of one of the biggest crowds of his campaign, Mitt Romney, joined by Paul Ryan, appeared at the outdoor Red Rocks Amphitheater and told a crowd of 12,000 that Colorado voters will put the GOP ticket over the top on Nov. 6th.
"We're on the home stretch now and I think the people of Colorado are going to get us all the way there. What do you think?," Romney said, to roars from the crowd Tuesday. "What you're seeing across this country as we've had these debates and as Paul and I have gone across the nation, you're seeing this movement growing."
The GOP ticket appeared at the outdoor rally outside of Denver, where their signature "R" logo reflected in the light on the enormous vertical rocks that surround the stunning venue. The crowd of thousands was packed into the stands, forming the emblem that is emblazoned on the Colorado state flag. Audience members were outfitted with noise makers, which they clapped at every pause, as well as chanting "Romney, Ryan!"
Romney spoke to the supportive crowd-noting signs that read "Democrats for Romney"- and urged the audience to talk to neighbors who may not be Republicans.
"I came in and some of the folks here were holding signs, "Democrats for Romney," all right? I love that. I love that," Romney said to cheers.
"Paul and I have a few things in common. One is, we both learned how to reach across the aisle in our elected office, to find ways to work with Democrats, Republicans and Independents to get the job done. And we need you to reach across the neighborhood to Democrats and Independents as well, make sure they understand that this is a year to vote for real change if you want to have real recovery."
Romney again reiterated, "I need you to get those folks to vote for us!"
Ryan also urged the crowd to stump for them asking to cheers, "Hey Colorado, are you ready to help us win this thing?"
Polls are deadlocked in the state with both tickets within the margin of error. Ryan has spent three days campaigning in the state and Romney noted early voting here, which started Monday, asking people to cast their ballots early in order to help out on Nov. 6th.
"There's early voting now," Romney said. "You can take your ballots and send them in if you've got them. If you've got your absentee ballots be sure to send them in. If you haven't got one get into the center and get sure that you get voted early. We want to get that done. We want to bank all those votes so on Election Day you can go out and get people to the polls that otherwise wouldn't get there. Would you do that for me?"
He thanked the audience, saying they are "helping change the course of a nation and setting the course on a path that will lead to greatness and prosperity again and again, that is the grassroots of America. That's the people of America. That's who we are tonight."
Romney spokesman Kevin Madden told reporters earlier Tuesday that the campaign is feeling optimistic about its chances in Colorado.
"I think they're all very close," Madden said of the swing states. "But we feel very, we feel very good about our prospects in Colorado."
Before Romney and Ryan took the stage, the crowd listened to entertainers and Romney supporters Kid Rock and country star Rodney Atkins, as well as New Mexico Gov. Susana Martinez.