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President Barack Obama's approval rating in Tennessee has plummeted since the spring, a new poll released Wednesday by Vanderbilt University shows.

Support for Obama dropped to 28 percent among the state's registered voters, down from 40 percent last May, Vanderbilt's Center for the Study of Democratic Institutions said after polling 860 registered voters in late November and early December. The president's support among Tennessee Democrats fell to 68 percent this fall from 83 percent in May.

Support for the Affordable Care Act remained low, with only 15 percent of Tennessee voters saying they approve of Obama's health care reform law. But 63 percent said they believe Tennessee should expand the state's Medicaid program using federal money, as the law calls for.

Heading into the 2014 campaign, Tennessee Gov. Bill Haslam's approval rating was 61 percent. Sen. Lamar Alexander's approval rating was 49 percent.

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