Klobuchar is now party of a group of White House hopefuls that includes other high-flying female US senators, charismatic military veterans and a young gay mayor. And it is likely to grow before the US primary season gets underway a year from now. Here are the first entrants in the presidential race, 21 months before the election.
The 58-year-old granddaughter of an iron miner, Klobuchar is a former prosecutor with an unpretentious demeanor. She has quietly gained attention in Washington as a centrist. Klobuchar is known for putting partisanship aside to pass legislation, something that has earned her a devoted following in Minnesota, and something American voters regularly tell pollsters they want.
Klobuchar has promised more stringent gun laws and set a target of universal health care, while calling for America to support its troops, diplomats and intelligence officers.
But claims about her work ethic have cast a shadow over her goals. Several former aides have been quoted saying she is difficult to work for, with bouts of "explosive rage" leading to exceptionally high staff turnover. Her defenders say she is simply someone who demands excellence, and that the allegations against her would not be made against a man.
At 69, the US Senate's consumer protection champion from Massachusetts became the first high-profile Democrat to enter the race when she announced a presidential exploratory committee on December 31. She officially kicked off her White House run on Saturday. Warren is on the party's left flank, and built her reputation by holding Wall Street accountable for its missteps. She is considered to have one of the best campaign organizations of any Democrat.
Trump has already taken aim at Warren, mocking her proclamation of Native American heritage.
The 49-year-old US senator from New Jersey announced his candidacy February 1, evoking the civil rights movement as he promised to work to bring together a divided America. Often compared to former president Barack Obama, Booker began his career as a community activist and rose to prominence as mayor of Newark, New Jersey. He was elected to the US Senate in 2013, the first African-American senator ever from that state.
This New York senator made a name fighting the battle to end sexual assault, especially in the military, before the #MeToo movement gained national prominence. The 52-year-old, a fierce Trump critic, is making gender and women's issues a hallmark of her campaign.
The barrier-breaking senator from California who aspires to be the nation's first black female president announced her candidacy on a day honouring slain civil rights icon Martin Luther King Jr.
The daughter of an Indian immigrant medical researcher mother and a Jamaican economist father, Harris, 54, began her career as a district attorney in San Francisco before serving as California's attorney general.
A cabinet member in the Obama era and grandson of a Mexican immigrant, Castro announced his candidacy in English and Spanish on January 12 in the heat of the debate on immigration and border security.
A supporter of liberal Bernie Sanders in the 2016 race, military veteran Gabbard was criticised for meeting with Syrian leader Bashar al-Assad during that country's civil war, and for anti-gay positions that she has since retracted and apologised for.
Nine months younger than Gabbard is the South Bend, Indiana, mayor who joined the race unveiling a resolutely future-looking and optimistic message to counter Trump's darker vision.
A US Navy veteran who put his mayoral duties on hold to serve in Afghanistan, Buttigieg would become the first openly gay nominee of any major party.
The 44-year-old tech entrepreneur launched his campaign with little fanfare in late 2017, warning against the dangers that automation presents to US workers. He has advocated for a form of universal basic income as a way to reduce inequality.
An affluent Maryland businessman who served three terms in Congress, Delaney was the earliest Democrat to officially launch a bid, back in July 2017. He has crisscrossed the early-voting state of Iowa seeking to boost his name recognition.
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