WASHINGTON (CNN) -

In what may be the epic battle of the summer, the White House and Republicans are assembling their armies and sharpening their bayonets for a political fight over the selling of Obamacare.

On one side is the Obama administration, which is preparing to carry out the president's landmark health care reform law. It sees success directly linked to his legacy.

On the other side are House Republicans, conservative groups, GOP governors and tea party affiliates. They are reading the latest polls and are determined to make the repeal or severe crippling of the Affordable Care Act their top priority before the 2014 midterms.

"It's a very important battle and both sides are trying to come out on top," said Julian Zelizer, a Princeton University historian and CNN contributor. "The first stage was about whether this passes or not. ... Now the battle is over implementing it and there are all sorts of ways Republicans are trying to cause problems."

Zelizer said Republicans have been aggressively promoting the program's problems in the past few weeks.

"And the administration feels the pressure," he said.

The next phase of the fight for the White House, according to administration officials, is a series of initiatives aimed at using social media, websites, on-the-ground efforts and targeting Spanish speakers and young people in particular to convince as many uninsured as possible to buy insurance when it becomes available on October 1.

"We've got to make sure everybody has good health in this country," President Barack Obama told Morehouse College's commencement ceremonies recently. "It's not just good for you, it's good for this country. So you're going to have to spread the word to your fellow young people."

Meanwhile, Republicans are continuing to whittle away at the law's impact and are hoping that Obamacare's failure could become a rallying cry.

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Next health care law fight could be ugliest yet