Sen. Cory Booker Cory Anthony BookerDemocratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility Black Voters Matter Fund deploying voter outreach caravans in 12 states to drive turnout Philanthropist Susan Sandler investing 0M in social justice organizations MORE (D-N.J.) raised $6.6 million in the fourth quarter of 2019, narrowly exceeding his fundraising haul from the previous quarter but lagging his top rivals for the Democratic presidential nomination.

More than half of the contributions to Booker’s campaign in the fourth quarter were from new donors, and the average donation size was just under $23, according to Booker’s campaign.

The final three months of 2019 marked Booker’s best fundraising period thus far. He posted roughly $6 million in the third quarter of the year and $4.5 million in the quarter before that.

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However, he’s still well-behind most of the other Democratic presidential candidates in fundraising: Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) announced this week that he had raised $34.5 million in the last three months of 2019, while former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE (D) and former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE brought in $24.7 million and $22.7 million, respectively.

Addisu Demissie, Booker’s campaign manager, acknowledged in a statement that the New Jersey senator was lagging behind his rivals.

He also criticized the Democratic National Committee’s criteria to qualify for its presidential debates and took aim at the lack of diversity in the primary field, pointing to former Housing and Urban Development Secretary Julián Castro’s decision this week to drop out of the race.

“We’re thrilled to have closed out 2019 with our best fundraising quarter yet, despite not being able to join the December debate stage due to the artificial thresholds that prevented viable candidates from participating,” Demissie said.

“But to put it bluntly, we’re still behind the fundraising of a field of predominantly white candidates who have been able to haul in significantly greater sums of money or tap into their personal fortunes to fund their campaigns," he continued. "In the wake of Julian Castro Julian CastroSanders says Democrats should have given more speaking time to progressives Castro says DNC should have put more Latino speakers on stage from beginning Jill Biden defends husband's cognitive ability from Trump attacks: 'It's ridiculous' MORE’s departure, we find ourselves at a juncture where what started out as the most diverse field of candidates running for president in our nation’s history is increasingly becoming one that does not reflect the rich diversity of our party and of our country.”

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Booker has seen his political prospects diminish in recent months as he’s struggled to break out in polls and keep pace with his top rivals in fundraising.

In September, Demissie suggested that Booker would drop out of the presidential race if he was unable to raise $1.7 million in the final 10 days of the third fundraising quarter, saying that without a last-minute cash injection, the senator would not have the resources to remain competitive.

Booker eventually reached that goal, but his latest fundraising numbers show him falling behind candidates he had once surpassed, including Sen. Amy Klobuchar Amy KlobucharEPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates Biden marks anniversary of the Violence Against Women Act, knocks Trump and McConnell MORE (D-Minn.), who raised $11.4 million in the fourth quarter of 2019, up from just $4.8 million the quarter before.