Here's the WSJ on the passage of the bill:

Colorado lawmakers passed landmark legislation that would make it tougher for public-school teachers to earn tenure and easier for them to lose it.

The bill—one of the most aggressive state efforts to overhaul teacher-tenure rules—went to Democratic Gov. Bill Ritter's desk Thursday. He has said he would sign it into law.

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• POLITICS
• MAY 14, 2010, 12:24 A.M. ET
• http://online.wsj.com/article/SB10001424052748703950804575242483164677818.html

Teacher-Evaluation Bill Approved in Colorado

By STEPHANIE BANCHERO