Ken Buck is likely headed to Washington after all. 

The 2010 Senate nominee, who was maligned in his race four years ago against Sen. Michael BennetMichael BennetTrump's FDA nominee clears key Senate committee Dems knock Trump on Earth Day Dem pushed plan for both sides to admit to abusing Senate rules: report MORE (D-Colo.), won the open 4th District House GOP primary Tuesday night. Now, Buck is the odds-on favorite in the fall to succeed Rep. Cory GardnerCory GardnerOvernight Defense: Commander calls North Korea crisis 'worst' he's seen | Trump signs VA order | Dems push Trump to fill national security posts Senators get North Korea briefing in unusual WH visit A Vandenberg movement in Congress MORE (R-Colo.), who is running for Senate. 

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The Associated Press has called the race for Buck, who had 44 percent of the vote with 58 percent of precincts reporting. Buck's closest opponent, state Sen. Scott Renfroe, took just 24 percent despite winning the top spot on the ballot at the district convention. 

Still, Buck was perceived to be the favorite headed into the primary. He had originally been seeking to unseat Sen. Mark UdallMark UdallPicking 2018 candidates pits McConnell vs. GOP groups Gorsuch's critics, running out of arguments, falsely scream 'sexist' Election autopsy: Latinos favored Clinton more than exit polls showed MORE (D-Colo.) this year but dropped out of the race when Gardner announced his candidacy. Gardner himself endorsed Buck to succeed him shortly after entering the Senate race.

Along with Gardner's endorsement, Buck had outraised all of his primary opponents, collecting more money than his three competitors combined. Supporters donating to Buck's campaign were the KochPAC, linked to billionaire brothers David and Charles Koch, and outgoing House Majority Leader Eric CantorEric CantorTrump nominates two new DOD officials Brat: New ObamaCare repeal bill has 'significant' changes Overnight Energy: Flint lawmaker pushes EPA for new lead rule MORE's (R-Va.) leadership PAC.

Buck will go on to face Democrat Vic Meyers and Libertarian nominee Jess Loban in the general election, but he’s expected to easily win in the GOP-leaning district.