I know Bob Barr switched political parties, but I wasn't aware that Casey Cagle had done so.

Gov. Sonny Perdue writes in the AJC:

While most of the comments [over the past two weeks about this year's Criterion-Referenced Competency Test] scores have been well-intentioned and made with our students' best interest in mind, regrettably, some Democratic leaders have tried to spin the results into a wholesale indictment of Georgia schools, teachers and students.

And the AJC's Political Insider reports what Lt. Gov. Casey Cagle had to say on the subject this past Thursday in Marietta in response to someone's observation that something is aromatic in Denmark:

Your point’s very well taken. What I’ll say to you is the system’s broke. What we have today in education, truly, is a bureaucratic maze that micro-manages the entire process.

We’ve gotten away from allowing teachers to truly teach. That doesn’t exist. We’ve tied the hands of teachers. We’ve allowed a funding formula to drive everything that goes on in the classroom. That’s the problem.
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The above link to Gov. Perdue's remarks are from a letter he wrote to the AJC commenting on the CRCT scores and his take on the status of education in general in Georgia.

Remarks by former Gov. Roy Barnes are contained in a letter to the AJC on the same topic.