The Denver Post: Another Democratic primary in Colorado. Another wave of campaign mailers and attack ads that frequently, as far as the public can tell, emerged from a black hole.

The new glut of spending in state legislative races had already soared past $1.4 million as of early June and will almost certainly increase in dramatic fashion before voting ends in the June 30 primary. The arms race — and spending race — is the latest in an ongoing conflict between outside groups backed primarily by business interests, who prefer more moderate Democrats, and the state’s largest unions, which have spent to support more progressive candidates.

The money battle follows a 2024 primary in which outside groups spent $5 million to influence the Democratic races. It’s part of a broader tug-of-war for control over Colorado’s dominant political party, which has grown into near-supermajority control of the state legislature.

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