Health care, more than any other issue, led the debate.
Most of Warren's rivals Wednesday night, including former O'Rourke and Minnesota Sen.
"Who is this economy really working for?"
Mr Inslee said he was the only candidate on the stage who had passed a public healthcare option and a law protecting a woman's right to reproductive health and health insurance.
Questions over private health insurance have provoked the first clash of the Democratic presidential debate.
Democratic presidential candidate Sen. Elizabeth Warren about gun control in the United States.
Former secretary of housing and urban development Julian Castro: "China and climate change".
"If you truly want to change the system, that we've got to repeal that section... then it might as well be the same policy", Castro said.
What they heard right off the bat was Ms Warren, the ideological progressive and only candidate on stage polling in double digits, knocking what she calls a rigged economy. She was flanked by several candidates, including O'Rourke and Booker, who needed a breakout moment. Cory Booker of New Jersey, former Texas Rep. Beto O'Rourke and Sen.
That drew a sharp response from Klobuchar. No one openly stumbled. Absent the ugly attacks or missteps that marred debates of past elections, the two-hour discussion allowed the Democratic Party to show off its extraordinary diversity.
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The diversity of the modern Democratic Party was on display on Wednesday night - three women, one black man and a man of Mexican heritage vying for the presidential nomination. Klobuchar talked for 8.5 minutes, while Gabbard spoke for 6.6.
Instead of Trump, Democrats leaned into the issue that helped deliver the party the House majority past year: Health care. He challenged O'Rourke and others to support him.
Mr O'Rourke said private insurance was "fundamental to our ability to get everybody cared for", but Mr de Blasio cut him off. Bernie Sanders and former Rep. Beto (BET'-oh) O'Rourke slotted campaign stops Thursday, while six others are going Friday. "Why do we have to stand for taking away something from people".
De Blasio, who joined Warren in raising his hand on health insurance, cast the debate as part of "the battle for the heart and soul of our party".
Trump is on his way to Japan for the G20 summit.
Despite flying to Asia Wednesday, Trump tuned in from Air Force One and did not miss the chance to knock his would-be opponents via Twitter. His first tweet of the night: "BORING!"
But the candidates didn't agree on everything.
Castro was the first candidate in the crowded field to put forward a plan back in April and pointed out that he supports decriminalizing border crossings, not just for those seeking asylum in the US because that is legal and requires a person to be on USA soil to do so, but "everybody else" as well.
"Yeah, everybody's mics are on", Todd told the candidates, later adding, "I think we had a little mic issue". Castro said he would decriminalize border crossings by migrants, which he said had led to the separation of families.
New Jersey Sen. Cory Booker talks about what he would do day one to improve immigration laws in the US, spurring a passionate reaction from Julian Castro. While the crowded field has been courting voters in key states for several months already, the vast majority of the nation has yet to pay close attention to the diverse field.