Mark Udall

Colorado is one of the battleground states where Republicans made big gains this week. Republicans in the state believe they now have momentum going into the 2016 presidential election.

But the GOP has suffered some punishing losses there lately, owing in part to the state's changing demographics. That trend may still be a big factor in 2016.

The last time Republicans won a U.S. Senate seat here was when Wayne Allard was re-elected in 2002. Back then, Congressman and now Senator-elect Cory Gardner was a young staffer working behind the scenes for Allard.

Nathan Heffel / KUNC

In a race polls had consistently neck-and-neck, Republican Cory Gardner celebrated a decisive victory for one of Colorado's two U.S. Senate seats Tuesday night over incumbent Democrat Mark Udall. Gardner becomes the first candidate to unseat an incumbent Colorado Senator since 1978.

Election 2014: Colorado U.S. Senate Results

Nov 4, 2014
Udall - U.S. Senate | Gardner - U.S. House

Colorado's U.S. Senate seat has been a tightly fought race characterized by a razor-thin difference between the candidates in the polls. It's also been a race that many nationally have pinned control over the Senate on. Polls in Colorado close at 7 p.m. MST, results will be gathered here.

Aranami / Flickr - Creative Commons

Watching election returns can seem boring. However recent elections in Colorado have become something worth watching. Colorado's U.S. Senate and gubernatorial races are too close to call. Those race results will be the byproduct of an increasingly complex election and demographic landscape developing across the state.

What follows is a short list of characters and storylines to consider that go beyond the candidates. So pop your popcorn and settle in for some political night drama.

Ken Lund / CC BY-SA 2.0

Election Day is less than a week away, and campaigns for close races for U.S. Senate and Governor are making their final pitch to voters. In order to get a sense of what could tip the balance in these tossup races for Governor and Senate, we picked the brains of reporters that work at the state capitol.

A new poll finds Colorado's Governor and Senate races remain close. Republican Cory Gardner is still ahead of Democrat Mark Udall in the Senate race, but the gap has closed to 3 points, with 46 percent for Gardner, and 43 percent for Udall. The governor's race remains a statistical dead heat between Democratic Governor John Hickenlooper and Republican Bob Beauprez, with 45 percent in favor of Hickenlooper and 44 percent for Beauprez.

Grace Hood / KUNC

Incumbent Democratic Senator Mark Udall swung through the University of Northern Colorado in Greeley to recruit volunteers and get voters fired up for Election Day. The county is well-known as a conservative stronghold expected to support Republican challenger Cory Gardner.

"We need you all to get out, get people into the neighborhoods, knocking on the doors, making the case," Udall told the small group, stressing that every vote counts.

Udall / U.S. Senate / Gardner / U.S. House

Whether it’s advertising on television, commercial radio or even YouTube, both sides in Colorado’s U.S. Senate race are ramping up their efforts to get a leg-up in the final weeks before the election. It turns out the candidates are receiving a significant amount of funding from Super PACs outside of the state, underscoring a race that is seen as critical for control of the Senate.

Udall - U.S. Senate | Gardner - U.S. House

Democratic Senator Mark Udall and Republican Congressman Cory Gardner had a spirited debate Tuesday night hosted by The Denver Post. Both candidates are locked in a tight race and both stayed on message in the hour-long debate.

Udall attacked Gardner as extreme and out of touch, Gardner criticized Udall for being in lockstep with President Barack Obama.

Bo Birkeland / RMCR

With Colorado's U.S. Senate race too close to call, both parties are on an all-out blitz to court as many voters as they can prior to the November election. The youth vote has traditionally helped Democrats, but Republicans see an opening with national support for President Obama falling among the millennial generation.