Colorado Primary Preview: Bennet vs. Weiser for an Open Governor's Seat, and the Odds Up and Down the Ballot
- Colorado votes Tuesday, June 30. The headline is the open Democratic primary for governor, where U.S. Sen. Michael Bennet is trying to hold off Attorney General Phil Weiser. Polymarket makes Bennet the favorite, around 67% to Weiser's 33%, though a late poll swing toward Weiser has made it a real race.
- Whoever wins is the heavy favorite in November. The seat is open because Gov. Jared Polis is term-limited, and the books line up: the Democrat is 91% on Kalshi and 92% on Polymarket to keep it, in a state that has not elected a Republican governor since 2002.
- Sen. John Hickenlooper looks safe. He faces a progressive challenge from state Sen. Julie Gonzales, but Polymarket prices him near 91% to win renomination, and the markets see the seat staying blue.
- The real November prize is CO-08. Republican Rep. Gabe Evans is a lock in his own primary, while Democrats pick between Manny Rutinel (mid-60s on Polymarket) and Shannon Bird. Polymarket already leans to the Democrat, around 75%, to flip the seat.
- Two more primaries are live bets: pastor Victor Marx leads the GOP governor race near 75% on Polymarket, and longtime Rep. Diana DeGette is in a near-even Democratic primary with progressive Melat Kiros in CO-01.
DENVER - Colorado will hold its primary on Tuesday, June 30, and for a reliably blue state, the prediction markets tell a clear story: most of the suspense is in the Democratic primaries, while November is close to settled almost everywhere except one swing district. Here is how Kalshi and Polymarket price the ballot.
Governor: Bennet vs. Weiser Is the Main Event
The open governor's race drew two big Democratic names. U.S. Sen. Michael Bennet, in office since 2009, is running against Attorney General Phil Weiser. Polymarket makes Bennet the favorite, pricing him around 67% to Weiser's 33% on a market that has traded more than $110,000.
It is closer than that gap suggests. Early public polls gave Bennet the edge, but a recent survey put Weiser in front, and Weiser has out-raised Bennet and gained momentum in the final weeks. Weiser has also pushed a pointed argument: that Bennet should stay in the Senate to keep fighting the Trump administration rather than give up the seat.
The November math is not close, and both books agree. Kalshi prices the Democratic nominee at 91% to win the governorship, and Polymarket has the Democrat at 92%, leaving the Republican in single digits on each. No Republican has won the office in Colorado since 2002, or any statewide race since 2016. Among the broader 2026 gubernatorial odds, Colorado ranks as one of the safest Democratic holds in the country. On the Republican side, Polymarket makes pastor and first-time candidate Victor Marx the front-runner, around 75%, ahead of state Sen. Barb Kirkmeyer and state Rep. Scott Bottoms. Marx has about $2.7 million raised and a May poll that put him at 42%, though some local analysts doubt he holds up. Either way, the GOP nominee starts deep underwater in the fall.
Senate: Hickenlooper Is a 91% Lock
Sen. John Hickenlooper, a former governor and Denver mayor who has never lost an election, is the safest big name on the ballot. He faces a progressive primary challenge from state Sen. Julie Gonzales, but the market is not impressed. Polymarket prices Hickenlooper at about 91% to win renomination, with Gonzales near 7%.
The Republican side is even more settled. State Sen. Mark Baisley is the only serious candidate, and Polymarket has him at about 98%. For November, the markets keep Colorado's Senate seat solidly in the Democratic column, in line with Kalshi's forecast map, which shades the race blue. Hickenlooper enters as a clear favorite to keep it. On the wider board of U.S. Senate odds, Colorado sits among the safer Democratic seats.
CO-08: The Race That Actually Matters in November
If Colorado has a true battleground, it is the 8th District, north of Denver around Thornton, Commerce City and Greeley. It was drawn to be competitive and has lived up to it, flipping from Democrat Yadira Caraveo in 2022 to Republican Gabe Evans in 2024, with Trump carrying the seat by about 50% that year.
Evans faces only token opposition in his own primary, so the action is the Democratic race. State Rep. Manny Rutinel, a progressive who raised more than $3 million and swept the party assembly, leads the Polymarket primary in the mid-60s. State Rep. Shannon Bird, a centrist with a strong record on effectiveness, is his main rival.
Here is the betting twist. Even though the seat is one of the most competitive in the country, Polymarket's general-election market already leans to the Democratic nominee, around 75% to flip it in November. That reflects a strong national climate for Democrats, with generic-ballot polling running several points in their favor. In other words, the market treats the June 30 Democratic primary, not the fall, as the bigger question mark in CO-08, which ranks near the top of the most competitive House of Representatives odds this cycle.
The Rest of the House
The other seats are not expected to change party hands, but one Democratic primary is a live bet. In the 1st District, in Denver, longtime Rep. Diana DeGette, first elected in 1996, is in a near-even primary with progressive challenger Melat Kiros, and the market rates it close to a coin flip, with DeGette holding a slight edge. Whoever wins keeps the safe blue seat.
Elsewhere, Democrats Joe Neguse in the 2nd, Jason Crow in the 6th and Brittany Pettersen in the 7th are safe, as are Republicans Lauren Boebert in the 4th and Jeff Crank in the 5th. The one Republican primary worth a glance is the 3rd District, on the Western Slope, where freshman Rep. Jeff Hurd faces a challenge from hardliner Ron Hanks. Hurd is favored, and the seat leans Republican in November.
The Odds Board
For a betting audience, Colorado splits cleanly between the two books. The live primary money is on Polymarket: Bennet around 67% for governor, Marx near 75% on the GOP side, Hickenlooper near 91% for Senate, Baisley about 98%, and Rutinel in the mid-60s in CO-08. The November picture is a near sweep for the Democrats on both books: the Democrat at 91% on Kalshi and 92% on Polymarket for governor, Colorado's Senate seat shaded safely blue, and CO-08 the lone competitive race, where Polymarket still favors the Democrat near 75%.
One note on the numbers. The primary figures are each candidate's chance to win the nomination, not a share of the vote, and the general-election figures are the chance to win in November. The CO-08 "tossup" label describes the district's fundamentals; the market itself currently leans Democratic there.
The Bottom Line
Colorado's June 30 primary is unlikely to change who is favored to run the state. A Democrat is the strong bet for governor, 91% on Kalshi and 92% on Polymarket, and Hickenlooper is the strong bet to keep his Senate seat. The headline is simply which Democrat wins the open governor's race, Bennet or Weiser.
For the latest election odds, the race to keep watching past June 30 is the 8th District. It is the one Colorado seat where the markets still see a real contest in November, even if they lean toward the Democrat to flip it.
