Washington (CNN) - President Barack Obama's renewed effort to sell his health care law will take him to the heart of Republican Texas on Wednesday, where he'll hit the state's GOP leaders for rejecting a key facet of the Affordable Care Act that could extend coverage to millions of uninsured Texans.
Obama's trip to Dallas comes amid a fresh attempt by the administration to encourage Americans to sign up for the law's health care exchanges, which officially opened for enrollment on October 1. That effort has been stymied as the website where people can enroll was brought down with technical problems.
Texas ranks highest in the nation in the percentage of people without insurance - a statistic the White House says makes the state ripe for participation in the new health care program.
But the state's Republican governor has resisted one aspect of Obamacare–the expansion of Medicaid for people with annual incomes at or below 133% of the federal poverty level.
The U.S. Supreme Court's 2012 decision upholding the Affordable Care Act's individual mandate also deemed states could opt out of the Medicaid provision.
Texas Gov. Rick Perry did just that, saying the federal Medicaid program was already ineffective and that participating in the expansion and establishing a state exchange would amount to "brazen intrusions into the sovereignty of our state."
While some other Republican governors have also rejected the Medicaid expansion, others - including Ohio's John Kasich and Michigan's Rick Snyder - have adopted the program. Obama will cite those governors Wednesday, according to David Simas, a White House deputy senior adviser.
Obama will call on "folks in Texas to join conservative governors in other states, like Ohio and Michigan and Arizona, to put politics aside and not deny people healthcare out of ideology and politics," Simas said.
In Dallas - where 28% of the total population goes without health insurance - Obama will visit the city's Temple Emanu-El to see firsthand how people are signing up for the health care law.
"Navigators," or community members versed in the sign-up process, have been working through the website issues to help Americans enroll over the phone and through paper applications, though internal memos released this week indicated those methods still relied on the website to complete the sign-up process.