Senator Lindsey Graham acknowledged former Vice President Joe Biden's longtime political clout, but he reiterated that California Senator Kamala Harris is "a force to be reckoned with."
"It makes you wonder. What are we hiding?" Democratic candidate Julian Castro said.
Sanders, who announced her resignation earlier this month, has been replaced by Stephanie Grisham, a former spokeswoman for first lady Melania Trump.
"By the way, with all due respect I say to Chicago and everyone: My president gets much too little credit for all that he did," Biden said of Obama.
"And Eric Swalwell take a seat, you're an asterisk on the end, Ok?" Meghan McCain concluded on 'The View' Friday.
From free college to reparations, the math just doesn't add up, and if Democrats continue down this path, they're likely headed for defeat in 2020.
"It's everywhere and it has all the signs of being a coordinated/artificial operation," wrote behavioral scientist Caroline Orr, who first highlighted the surge of duplicate messages about Harris.
Kamala Harris has seen her odds of gaining the Democratic nomination shorten while Joe Biden and Beto O'Rourke have taken a hit.
During Thursday's debate, Kamala Harris was one of two candidates to raise their hand when asked if they supported eliminating private insurance.
President Donald Trump sat down for a meeting with Russia's President Vladimir Putin at the G20 Summit in Osaka, Japan.
"Marianne Williamson is doing an incredible job for someone who is obviously digesting an edible on television," Pablo S. Torre tweeted.
Harris saw a 500 percent increase in searches in the second half of Thursday's debate.
Some needed to prove themselves while others just needed to maintain their lead. Here's how every candidate ranked on night two of the first Democratic debates.
"America does not want to witness a food fight. They want to know how we're going to put food on the table," Kamala Harris said.
"I did not oppose busing in America. What I opposed was busing ordered by the Department of Education," Biden said.
"That's the end of that race!" the president tweeted confidently.
"Marianne Williamson is the only candidate bold enough to propose a witchcraft based health care system," one user tweeted.
"My time's up, I'm sorry," Joe Biden said after being fiercely attacked by Kamala Harris on his history on race.
"I was 6 years old when a presidential candidate came to the California Democratic convention and said it is time to pass the torch to a new generation of Americans," Eric Swalwell said of Joe Biden.
"Sartorial update: once we pass universal basic income, Andrew Yang can purchase a tie," Preet Bharara tweeted.
"The last poll I saw had us 10 points ahead of Donald Trump," Bernie Sanders replied after his socialists policies were attacked by his 2020 Democratic rivals.
"How long before you're banned from speaking [English]" Tucker Carlson asked on his Fox News show Thursday. "Better to learn Espanol if you want to talk to your grandkids"
"I did not know the phrase I used in Miami today was associated with Che Guevara & I did not mean to offend anyone who heard it that way," de Blasio tweeted.
Thursday's debate will feature Pete Buttigieg, Biden and Sanders as well as wild cards Andrew Yang and Marianne Williamson.
"A win for me would be that millions of Americans get a sense of me and my message and check out my campaign afterwards," Yang said.
Speaking as a professional debate educator, I wouldn't say the lessons of persuasive public speaking, critical thinking and respect for civil discourse were the candidates' top priority in Miami. More like survival.
More than ever before, voters are demanding action on this crisis.
"I'll be honest, I really do think that this was a breakaway night," she said in her appearance on "The Late Show."
President Donald Trump let rip at NBC on Twitter after audio problems during its first 2020 Democratic Party debate.