The race for the Democratic nomination in Indiana is tight.

Hillary Clinton receives the backing of 46 percent of likely Democratic primary voters, while Bernie Sanders captures 42 percent, according to a Fox News Poll released Friday. That’s within the poll’s margin of error.

Clinton is preferred by voters ages 45 and over (+28 points), women (+24), and non-whites (+6).

Sanders is the pick among voters under age 45 by a whopping 51-point margin. Men (+21 points) and voters with a college degree (+5) also favor him.

"It's all about age and gender," says Daron Shaw, Republican pollster who conducts the poll with Democratic Pollster Chris Anderson.

CLICK TO READ THE POLL RESULTS

"As we move away from the South, blacks have been less critical for Clinton's success and women have become more important."

Most Clinton (87 percent) and Sanders supporters (78 percent) have a high degree of vote certainty. Still, one in five of those backing Sanders says they could change their mind (21 percent).

The Indiana primary is May 3.

The poll also asked voters to think about November. If it’s between Clinton and Donald Trump, most Democratic primary voters say they would be happy with those two options (73 percent). However, one in four says they would either consider voting for a third party candidate (20 percent) or wouldn’t vote (five percent). Among Sanders supporters, that number increases to 41 percent saying they wouldn’t back Clinton as the nominee.

The Fox News Poll is conducted under the joint direction of Anderson Robbins Research (D) and Shaw & Company Research (R). The telephone poll (landline and cellphone) was conducted April 18-21, 2016, with live interviewers among a random sample of 1,205 Indiana voters selected from a statewide voter file (plus or minus 2.5 percentage points). Results for the 603 likely Democratic primary voters have a margin of sampling error of plus or minus four points.