The approval ratings of both President Donald Trump and Sen. Bob Corker have dropped more than 10 percentage points since November 2016, a new Vanderbilt University poll shows.

Meanwhile, Gov. Bill Haslam remains the most popular politician in the state, the poll found.

The Fall 2017 Vanderbilt-Poll Tennessee shows that Trump's approval rating fell from 60 percent in November 2016 to 48 percent a year later. Corker’s approval rating dropped from 60 percent in November 2016 to 47 percent this year.

The approval rating of Sen. Lamar Alexander dropped from 60 percent to 44 percent.

The poll found that at the time of Trump's election, 54 percent of Tennesseans thought Trump was changing Washington for the better.

Now, just 35 percent think so. Conversely, in November 2016, 20 percent of Tennesseans thought Trump was changing Washington for the worse. Now that number has risen to 36 percent.

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"I think (the poll) provides a read of where the Trump effect stands here in the state," Vanderbilt political science professor John Geer said. "In fact, this pattern that we find where Trump support is declining and people don’t think he’s going to bring the right kind of change to Washington, this is part of a broader national pattern."

Vanderbilt political science professor Josh Clinton said he believes much of the decline in the president's approval rating is a shifting among independents in Tennessee that mirrors a national response.

The poll also found that Tennesseans think their peers are much more conservative than is actually the case, as more poll respondents identified as moderates.

“Here’s a state that Trump won handily, and even here we see kind of an erosion in Trump support and more dissatisfaction, that the change they thought they may have been getting by electing President Trump is not what they’re seeing going on in Washington,” Clinton said.

Also, almost the same number of Tennesseans believe the president is telling the truth most of the time as those who believe he rarely does, at 30 percent and 29 percent, respectively. Nine percent believed the president is telling the truth all of the time.

Geer said the question itself is a sign of the times.

“We normally would never ask such a question, but because there have been so many stories about the kinds of (statements) the president has made, we decided to ask it,” Geer said. “If all of the sudden we ask a whole bunch of people, how much does John Geer tell the truth and only 40 percent said most of the time, I’d view that as pretty disappointing.”

Both Geer and Clinton noted that the two Tennessee senators’ approval ratings were likely affected by a dip in the views of Congress as a whole.

Both Corker and Alexander have been in the spotlight in the past year. Corker has had high-profile feuds with Trump, and Alexander faced criticism over health care and the nomination of Betsy DeVos as education secretary. Alexander leads the committee that oversaw her nomination hearings.

While the governor’s approval rating dipped in the middle of the year, Haslam remains the most popular politician in the state by a margin of more than 10 percentage points, according to the poll.

The poll, which surveyed 1,013 registered voters, was conducted Nov. 16 through Dec. 5. It has a margin of error of plus or minus 3.7 percentage points.

Reporter Jordan Buie can be reached at 615-726-5970 or at jbuie@tennessean.com. Follow him on Twitter @jordanbuie.