Voters who are fans of Sen. Elizabeth Warren are losing their affinity for a large number of candidates and increasingly falling behind Warren and a smaller group of candidates, new Insider polling shows.

Since the spring, the fraction of voters who say they like Warren — and, at most, one or two other candidates — has gone up by 10 percentage points.

Meanwhile, the percentage of voters who say they like Warren and three to five other candidates has dropped by 9.5 percentage points.

Voters who say they stand behind Warren — and only Warren — has gone up by 1.5 percentage points between the spring and fall, the poll found.

This is good news for Warren as she's been climbing up to the top of the Democratic field in a number of other national and state polls in recent weeks — giving former Vice President Joe Biden a run for his money.

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Fans of Sen. Elizabeth Warren are beginning to shift away from showing support for a broad number of candidates and are increasingly falling behind the Massachussetts senator and a smaller group of 2020 hopefuls, according to new Insider polling.

Since the spring, the fraction of voters who say they like Warren and at most one or two other candidates has gone up by 10 percentage points, according to the poll. Meanwhile, the number of voters who say they like Warren and three to five other candidates has dropped by 9.5 percentage points during the same period. At the same time, the percentage of voters who say the like Warren and six or more other candidates has remained stagnant.

Additionally, the number of voters who say they stand behind Warren — and only Warren — has gone up by 1.5 percentage points between the spring and fall, the poll found.

Though it's a slow process, it's a sign that while voters' first choices may remain in flux, for Warren the competition may be falling away.

To help make sense of where all the 2020 candidates stand, Insider has been conducting a recurring SurveyMonkey Audience national poll. You can download every poll here, down to the individual respondent data. (Read more about how the Insider 2020 Democratic primary tracker works).

The latest results are good news for Warren as she's been climbing up to the top of the Democratic field in a number of other national and state polls in recent weeks — giving former Vice President Joe Biden a run for his money. If Warren continues to see supporters of other candidates shift her way as they fall out of favor or drop out of the race, it could increase her prospects of becoming the frontrunner and ultimately the Democratic nominee.

At the moment, Biden continues to dominate most national polls, with Warren and Sen. Bernie Sanders of Vermont trailing. But Warren has pulled ahead of Biden in some polls, including in early voting states that are key to clinching the presidential nomination like Iowa and New Hampshire.

Warren and Sanders also raised more than Biden in the third quarter. Sanders raised $25.3 million, Warren raised $24.6 million, and Biden $15.7 million.

In short, things are looking up for Warren, particularly as Biden struggles to provide a forceful response to President Donald Trump's attacks amid the Ukraine scandal.