Colorado needs to invest more than three times what its governor proposed for college and university budgets — or risk further shutting out more students, weakening its colleges, and failing to prepare young residents to work and thrive in the evolving economy. The warning in a letter penned by 15 college presidents representing every state institution said Gov. Jared Polis’ proposed $52.5 million budget increase for colleges and financial aid wouldn’t cover their minimum operating costs. If adopted, the governor’s 2022-23 budget would precipitate a spike in tuition, presidents warned.