A measure to permanently cap tuition hikes at Colorado’s public colleges and universities has been rejected in the state Legislature. The Senate Education Committee voted 5-4 on party lines yesterday to reject a bill to extend the current 6 percent hike cap indefinitely. The defeat was a blow to this year’s Democratic agenda. Republicans on the committee pointed out that even the 6 percent cap could mean tuition doubles in a couple decades. They called the cap an arbitrary limit on the institutions and an example of “micromanaging” the schools. The Legislature passed a tuition hike cap last year, but it’s not permanent. The bill would have made Colorado the first state with a permanent tuition hike cap.