From Alyson Klein at Education Week:
So what does this mean for education legislation—including No Child Left Behind reauthorization? Well, this session of Congress will be Harkin's last chance ever to put his stamp on a rewrite of the law, something he's listed as a priority. Harkin has already made a start, working with Sen. Michael B. Enzi, then the Senate education committee's top Republican on a bipartisan revamp of the law back in 2011. The legislation got the support of three of the panel's GOP members, but never made it to the floor of the Senate. Presumably, having started that work, it seems Harkin would want to try and finish the job, especially since his home state of Iowa didn't get a waiver to get out from under the mandates of the current NCLB law.
This could set up an interesting dynamic with the Obama administration, which appears to be hoping that Congress will hold off for awhile when it comes to ESEA so that its waivers, which have been issued to more than 30 states, have a chance to work. Also, the administration wasn't exactly cheerleading Harkin's ESEA reauthorization bill, which it felt didn't push states to set ambitious enough goals for student achievement, especially when it comes to the achievement of traditionally overlooked subgroups of students (such as racial minorities). Secretary of Education Arne Duncan was also bummed that Harkin's bill didn't require districts to evaluate teachers based on student achievement.