After several weeks of stagnation on the Democratic side of the presidential race, a new Morning Consult poll shows Sen. Bernie Sanders (I-Vt.) gaining on former Secretary of State Hillary Clinton.

In the new survey, taken March 11 through March 13, 40 percent of likely Democratic voters back Sanders, up from 36 percent a few days earlier. And while Sanders’ support grew 4 percentage points, Clinton’s declined by 4 points, to 48 percent.

It’s the first time since mid-February that Clinton’s support dipped below 50 percent.

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On the Republican side, Donald Trump remains the front-runner with 42 percent of likely GOP voters opting for the real estate mogul. After surging in our previous poll, Sen. Ted Cruz held steady in second: 23 percent of respondents said they would support the Texas Republican.

The new poll also brought more bad news for Florida Sen. Marco Rubio, who will face heavy pressure to drop out of the race if he fails to win his home state on Tuesday. Only 12 percent of respondents said they would pick Rubio, down 2 percentage points from the previous poll.

Ohio Gov. John Kasich, who also faces a must-win race in his own state Tuesday, also dropped one percentage point (to 9 percent) from our previous poll.

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The Morning Consult survey polled 4,027 registered voters and has a margin of error of plus or minus 2 percentage points. See the toplines and crosstabs.