Alexandria Ocasio-Cortez says she will get behind Joe Biden, a moderate, if he becomes the nominee.

Rep. Alexandria Ocasio-Cortez said she has concerns that people may not come together behind whoever is the eventual Democratic nominee and said the most important thing of all is to beat President Donald Trump at the election.

Ocasio-Cortez, a democratic socialist who has endorsed Sen. Bernie Sanders in the 2020 race, told Seth Meyers she will get behind former vice president Joe Biden, a moderate, if he becomes the nominee.

"I've said throughout this entire process that what is so important is that we ultimately unite behind who that Democratic nominee is," the New York Democrat said during her appearance on Late Night with Seth Meyers Thursday evening.

"I think it's a two-way street. I've been concerned by some folks that say if Bernie's the nominee they won't support him and the other way around.

"Right now, November, you know, this is more important than all of us and we really need to make sure that we defeat Donald Trump at the polls assuming—and knowing—how insane it's going to get between now and then."

Both Sanders and Biden have some substantial differences on major policy issues. But they have also both committed to fully support whoever becomes the Democratic nominee in their efforts to win back the White House from Trump and the Republicans.

There are signs, however, that not all supporters of Sanders or Biden would follow their favored candidate's lead.

A poll in January suggested that only a small majority of Sanders supporters would get behind the eventual nominee if their choice did not win.

The National Emerson College Poll of 1,128 registered voters between January 21 and January 23 found that 53 percent of Sanders supporters said "yes" when asked if they would support the Democratic nominee even if it is not their candidate.

Another 31 percent of Sanders supporters said it depends on who the nominee is and 16 percent said no altogether. The poll, conducted via landline calls and an online panel, has a 2.8 percentage point margin of error.

In contrast, the poll also found that 87 percent of Biden supporters said they would vote for whoever the nominee is while 5 percent said "no" and 9 percent said it depends on the nominee.

At the end of February, the Democratic strategist Tom Watson highlighted his "anecdotal panic data" about Democrats who say they would not vote for Sanders if he became the nominee.

"I've had more lifelong, super active, petition gathering, small contribution giving, endless meeting attending regular Democrats here in the now blue suburbs say they won't vote for Sanders if he's the nominee than any other likely nominee ever," Watson tweeted.

"I always say the same thing: are you out of your mind?! You have to vote Bernie. Strangely, that doesn't work. There's a level of pure antipathy I've never seen before - far beyond Dean-Kerry or Clinton-Obama or even Sanders-Clinton. Some kind of switch has been flipped."