(CNN) Sen. Amy Klobuchar of Minnesota raised $11.4 million in the final three months of 2019, marking the strongest fundraising quarter of her campaign. The amount, while lagging behind those of the higher-polling Democratic presidential candidates, more than doubled her third-quarter fundraising numbers.

Sen. Bernie Sanders of Vermont leads the field with $34.5 million raised in the fourth quarter, followed by former South Bend, Indiana, Mayor Pete Buttigieg at $24.7 million, former Vice President Joe Biden at $22.7 million and businessman Andrew Yang at $16.5 million, according to announcements from their campaigns.

All the candidates saw increases from their third-quarter fundraising figures.

The other member of the Democratic presidential race's top tier, Sen. Elizabeth Warren of Massachusetts, has not yet released her fourth-quarter fundraising numbers -- though her campaign told supporters late last week that, days from the deadline, she so far had raised $17 million, down from her $24.6 million in the third quarter.

Klobuchar's announcement allows her campaign to push the message of winning in the critical Midwestern swing states, from the candidate who proudly proclaims in her stump that "this isn't flyover country. I live here."

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