NASHVILLE, Tenn. (AP) -- More than five years after U.S. governors began a bipartisan effort to set new standards in American schools, the Common Core initiative has morphed into a political tempest fueling division among Republicans.
The U.S. Chamber of Commerce leads establishment voices -- such as possible presidential contender Jeb Bush -- who hail the standards as a way to improve student performance and, over the long term, competitiveness of American workers.
Many archconservatives -- tea party heroes Rand Paul and Ted Cruz among them -- decry the system as a top-down takeover of local schools. The standards were developed and are being implemented by states, though Common Core opponents argue that President Barack Obama's administration has encouraged adoption of the standards by various parameters it set for states applying to get lucrative federal education grants.
Tea party-aligned officials and candidates want to delay the standards or abandon them altogether in at least a dozen of the 45 states that adopted some part of the guidelines. Indiana Gov. Mike Pence on Monday signed the first Common Core repeal to make it through a legislature.
"Common Core is like Obamacare: They passed it before they knew what was in it," said William Evers, a Hoover Institute research fellow and lead author of a California Republican Party resolution denouncing Common Core.
To a lesser extent, Democrats must deal with some teachers -- their unions hold strong influence within the party -- who are upset about implementation details. But it's the internal GOP debate that's on display in statehouses, across 2014 campaigns and among 2016 presidential contenders.
The flap continues as students in 36 states and the District of Columbia begin this week taking field tests of new assessments based on the standards, although the real tests won't be given for another year.
Paul, a Republican senator from Kentucky, has joined seven colleagues, including Texas' Cruz, to sponsor a measure that would bar federal financing of any Common Core component. Florida Sen. Marco Rubio isn't among the eight, but he had already come out against the standards. So has Rick Santorum, a 2012 presidential candidate mulling another run.
On the other end of the spectrum is Bush, the former Florida governor and Rubio's mentor. "This is a real-world, grown-up approach to a real crisis that we have, and it's been mired in politics," Bush said last week in Tennessee, where he joined Republican Gov. Bill Haslam at an event to promote Common Core.
Haslam, who is running for re-election this year, is trying to beat back a repeal effort in the Tennessee legislature. "These are simply guidelines that say a fourth grader should be learning the same things" regardless of where the student lives, the governor said recently. "Historically, we haven't been good at setting high standards."
The National Governors Association and state education superintendents developed Common Core. Among other things, the framework recommends when students should master certain skills. For example, by the end of fifth grade, a math student should be able to solve complex problems by plotting points on x and y axes. A high school sophomore should be able to analyze text or make written arguments using valid logical reasoning and sufficient evidence.
The issue presents a delicate balancing act for some governors. Bobby Jindal's Louisiana and Scott Walker's Wisconsin initially adopted the new standards. Now both men -- possible presidential candidates -- watch as GOP lawmakers in their states push anti-Common Core bills.
Jindal, who was an NGA member during Common Core's development, won't say where he stands on repeal.
"When it comes to specific bills, when they get to the issue of standards, we'll sit down with the authors and provide our thoughts about it. But in general when it comes to standards, we don't want to weaken the standards," he told reporters last week.
Before Wisconsin lawmakers convened, Walker announced support for rethinking Common Core. In both states, however, the anti-Common Core measures linger late in legislative sessions.
Establishment Republicans in Georgia, meanwhile, derailed a repeal effort in favor of a "study commission" empowered only to make recommendations. Alabama GOP leaders have held off a repeal measure, as well.
Immediate political consequences of the disputes aren't clear. GOP officials and strategists say any fallout for them is dwarfed by Democrats' struggle with Obama's health care law. In the meantime, conservative candidates use Common Core as a symbolic rallying cry.
Tennessee state Rep. Joe Carr, a long-shot primary challenger to Republican Sen. Lamar Alexander, insists Common Core "is just one more overreach of a federal government that wants to insert itself into everything." An Alabama congressional hopeful, Scott Beason, casts Common Core as liberal indoctrination. In Georgia's crowded Republican primary for U.S. Senate, Rep. Paul Broun declared in a recent debate, "I want to abolish the Department of Education and get rid of Common Core forever." His first goal wouldn't necessarily accomplish the second.