The polls had hardly closed on election night before Governor-elect Phil Weiser, fresh off his victory speech, told reporters his landslide win should be a “clarion call to the Colorado Republican Party.”

“I want a serious Republican Party,” said Weiser, a two-term Democratic attorney general who trounced GOP nominee Victor Marx in the governor’s race, winning 61% of the vote to Marx’s 33%. “I didn’t get that this election.”

It was a theme Weiser returned to repeatedly throughout the 2026 campaign: “Competition makes us stronger,” he said in July. “It’s not healthy for any state to have one party that’s dominant because another party is dysfunctional. … It makes my job harder, because I’ve got to look harder for that counterargument.”

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Many pundits echoed the governor-elect’s view as Marx and his fellow Republicans down-ballot slid further into statewide political insignificance this year. Colorado “​​needs meaningful political competition,” wrote John L. Barry in The Colorado Sun; it “needs a sane, viable opposition party,” opined Colorado Politics’ Eric Sondermann; it “would be better off with two functional, competent political parties,” said 9News’ Kyle Clark.

Whether the Colorado GOP can regain the seriousness that Weiser and others are hoping for is a question only Colorado Republicans can answer. But in the meantime, Coloradans who value a robust dialogue between two opposing ideological points of view on how best to manage public policy are in luck: That’s exactly what’s been happening within Colorado’s ever-more-dominant Democratic Party, which will return to the statehouse in January with unprecedented dual legislative supermajorities — and deep internal divisions about exactly what to do with them.

Politics, after all, is the clash of interest groups, not teams of red and blue. And most of the major interest groups that shape public policy in Colorado have continued to clash energetically in the last eight years of one-party rule.

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Industry groups and environmentalists have continued to fight the state’s long-running oil and gas wars. Landlords, renters, homeowners and local governments have battled over housing affordability and property tax rates. Law enforcement groups and criminal justice reform advocates feuded over how to respond to a post-pandemic spike in crime rates and drug overdose deaths. Labor and capital have squared off over wage laws, workplace protections and collective bargaining rights.

Once, these policy disputes may have mapped neatly onto Colorado’s two-party system. Today, they’re being contested by two factions of the party in power: a progressive movement seeking to push state policymaking to the left, and a moderate bloc that’s been solicitous of growing concerns about tax and regulatory burdens from Colorado’s conservative business lobby.

A database of thousands of roll-call votes maintained by LegiScan, a nonpartisan data service that tracks state legislatures across the country, confirms the basic shape of this intra-Democratic divide. Well-defined groups of centrists in both chambers, many of them members of the Colorado Opportunity Caucus, were more likely over the last two legislative sessions to break from their fellow Democrats and vote with Republicans — often to block more progressive bills, or advance more conservative ones, in key committee votes.

Last week’s legislative leadership elections put a spotlight on the party’s factional fault lines, with Democrats in the state Senate electing their caucus’ two most moderate members, Senators Dylan Roberts of Frisco and Kyle Mullica of Thornton, to key leadership positions.

Roberts and Mullica are members of the Opportunity Caucus, a group that describes itself as “not focused on moving to the left or to the center, but on moving Colorado forward.” Since 2024, the emergence of the caucus and an associated campaign group, One Main Street Colorado, has led to a bitter transparency fight and formal ethics complaints at the Capitol — as well as a series of hotly contested Democratic primaries between moderates and overlapping slates of progressive candidates backed by the Colorado Working Families Party, the Democratic Socialists of America and other groups on the left.

Meanwhile, with lawmakers in the House electing to leadership two members of this more progressive bloc, incoming House Speaker Jennifer Bacon and Majority Leader Javier Mabrey, the party’s left flank is poised to exert a stronger influence on the lower chamber than ever before.

Democrats who embrace a big-tent philosophy tend to emphasize the shared goals that unite the party — to be sure, the data suggests both wings of Colorado Democrats’ supermajority have more in common with each other than with the Legislature’s shrinking Republican minority. And plenty of Democratic lawmakers at the statehouse don’t fit neatly into either faction. They may see themselves as mediators between the two, or hew more closely to one side on some issues but not others.

Still, at opposite ends of the party’s ideological spectrum lie some fundamental disagreements about what a state government should and shouldn’t guarantee to its citizens. In most other democracies around the world, few would expect a democratic socialist and tenants’ rights attorney from an urban district, like Mabrey, to belong to the same party as his soon-to-be Senate counterpart Roberts, a pro-business centrist and ex-prosecutor representing affluent mountain resort communities.

But even in the absence of a true multi-party system, this swing bloc of Democratic centrists has been one of the most important factors shaping Colorado lawmaking in recent years — second only, perhaps, to the frequent vetoes and veto threats issued by Democratic Governor Jared Polis, who will depart office in January.

In the last two sessions alone, moderate Democratic lawmakers have joined Republicans to block environmental and ratepayer protections targeting data centers; multiple bills enacting new eviction protections; multiple bills aimed at cracking down on overreach by federal immigration agents; a measure allowing cities to enact vacancy taxes on vacation homes; and stricter greenhouse gas reporting requirements for large corporations. And they’ve joined Republicans (and Polis) to enact laws supporting nuclear energy; cracking down on retail theft and enhancing some criminal penalties for other offenses; allowing cities to roll back minimum wage laws for tipped workers; and easing some wage and workplace protections for farmworkers.

It may be cold comfort to Colorado Republicans to know that the interest groups that once backed their party now largely pin their hopes on a group of moderate Democrats instead. But the Colorado Chamber of Commerce itself called the most recent legislative term one “in which business concerns were heard,” noting that “nearly every bill opposed vociferously by the business community ended up being killed or scaled back.”

As for Democrats, different parts of the party’s coalition will continue to try to gain the upper hand as Weiser takes office and lawmakers return to a host of hot-button issues in January, from data centers and surveillance pricing to rent control and the Worker Protection Act. Neither side is likely to end up perfectly happy with the outcomes. But for those who believe competition and dialogue produce good policy, arguments and counterarguments won’t be hard to find.