Biden, Harris set for second Democratic debate showdown

Former Vice President Joe BidenJoe BidenEight Democratic presidential hopefuls to appear in CNN climate town hall Hill Reporter Rafael Bernal: Biden tries to salvage Latino Support Biden, Buttigieg bypassing Democratic delegate meeting: report MORE will face off against Sen. Kamala HarrisKamala Devi HarrisEight Democratic presidential hopefuls to appear in CNN climate town hall Biden, Buttigieg bypassing Democratic delegate meeting: report The Hill's Morning Report - Trump on defense over economic jitters MORE (D-Calif.) for a second time on the second night of the CNN Democratic debates in Detroit on July 31.

Meanwhile, Sen. Bernie SandersBernie SandersTop Sanders adviser: Warren isn't competing for 'same pool of voters' Eight Democratic presidential hopefuls to appear in CNN climate town hall Top aide Jeff Weaver lays out Sanders's path to victory MORE (I-Vt.) will take on Sen. Elizabeth WarrenElizabeth Ann WarrenTop Sanders adviser: Warren isn't competing for 'same pool of voters' Eight Democratic presidential hopefuls to appear in CNN climate town hall In shift, top CEOs say shareholder value not top goal MORE (D-Mass.) on the first night of the forum, July 30. 

Sen. Cory BookerCory Anthony BookerEight Democratic presidential hopefuls to appear in CNN climate town hall Biden, Buttigieg bypassing Democratic delegate meeting: report F-bombs away: Why lawmakers are cursing now more than ever MORE (D-N.J.) also will take the stage on July 31, along with former Housing and Urban Development Secretary Julián Castro, tech entrepreneur Andrew YangAndrew YangEight Democratic presidential hopefuls to appear in CNN climate town hall Biden, Buttigieg bypassing Democratic delegate meeting: report Tim Ryan jokes he's having 'dance-off' with Andrew Yang MORE, Sens. Michael BennetMichael Farrand BennetBiden, Buttigieg bypassing Democratic delegate meeting: report The Hill's Campaign Report: Battle for Senate begins to take shape The Hill's Morning Report — Recession fears climb and markets dive — now what? MORE (D-Colo.) and Kirsten GillibrandKirsten Elizabeth GillibrandThe Hill's Morning Report - Trump on defense over economic jitters F-bombs away: Why lawmakers are cursing now more than ever White House offers reassurances amid recession fears as 2020 candidates sound alarm MORE (D-N.Y.), Washington Gov. Jay InsleeJay Robert InsleeEight Democratic presidential hopefuls to appear in CNN climate town hall Andrew Yang promises mass pardon to those imprisoned for nonviolent marijuana offenses 13 states file lawsuit over Trump 'public charge' rule MORE (D), New York Mayor Bill de BlasioBill de BlasioSenate Democrats push Trump to permanently shutter migrant detention facility The Hill's Campaign Report: Battle for Senate begins to take shape CNN to host de Blasio, Bullock town halls MORE (D), and Rep. Tulsi GabbardTulsi GabbardNative American advocates question 2020 Democrats' commitment The US can't seem to live without Afghanistan 2020 Democrats release joint statement ahead of Trump's New Hampshire rally MORE (D-Hawaii). 

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegEight Democratic presidential hopefuls to appear in CNN climate town hall Biden, Buttigieg bypassing Democratic delegate meeting: report The Hill's Morning Report - Trump on defense over economic jitters MORE (D) will join Sen. Amy KlobucharAmy Jean KlobucharEight Democratic presidential hopefuls to appear in CNN climate town hall Biden, Buttigieg bypassing Democratic delegate meeting: report Poll: Nearly 4 in 5 say they will consider candidates' stances on cybersecurity MORE (D-Minn.) and former Rep. Beto O'RourkeBeto O'RourkeO'Rourke: Trump driving global, U.S. economy into recession 2020 Democrats feel more emboldened to label Trump a racist Hillicon Valley: O'Rourke proposal targets tech's legal shield | Dem wants public review of FCC agreement with T-Mobile, Sprint | Voters zero in on cybersecurity | Instagram to let users flag misinformation MORE (D-Texas) on July 30, along with Rep. Tim RyanTimothy (Tim) John RyanBiden, Buttigieg bypassing Democratic delegate meeting: report Tim Ryan jokes he's having 'dance-off' with Andrew Yang The Hill's Campaign Report: Battle for Senate begins to take shape MORE (D-Ohio), Montana Gov. Steve BullockSteve BullockSunday shows - Recession fears dominate Bullock: Putting Cuccinelli in charge of immigration 'like putting Putin in charge of election security' Kudlow: Trump 'wants to take a look' at buying Greenland MORE (D), former Colorado Gov. John HickenlooperJohn Wright HickenlooperThe Hill's Campaign Report: Battle for Senate begins to take shape The Hill's Morning Report — Trump and the new Israel-'squad' controversy Colorado candidates vying to take on Gardner warn Hickenlooper they won't back down MORE (D), former Rep. John DelaneyJohn Kevin DelaneyPoll: Nearly 4 in 5 say they will consider candidates' stances on cybersecurity Native American advocates question 2020 Democrats' commitment Head of flight attendants group claims 'broad support' for 'Medicare for All' among union members MORE (D-Md.) and author Marianne WilliamsonMarianne WilliamsonBiden, Buttigieg bypassing Democratic delegate meeting: report The Hill's Campaign Report: Battle for Senate begins to take shape Native American advocates question 2020 Democrats' commitment MORE

The candidates with the highest poll numbers will be center stage at the debates. 

Warren and Sanders will be center stage the first night, while Harris and Biden will stand next to each other on the second night. 

The assignment is a rematch for Biden and Harris. The California senator attacked Biden head-on during the first debate, criticizing his civil rights record, specifically on busing. 

Harris experienced a bump in the polls and fundraising after she confronted Biden in the forum. 

Biden said after the first debate that he did not expect Harris to confront him in the way that she did on the issue. 

Booker, who has criticized Biden's past comments on working with segregationist senators, will stand on the other side of Biden, which could result in more moments of friction. 

The debate will also mark the first time progressives Sanders and Warren go head to head. 

Warren has risen in the polls in recent months, laying out detailed plans on her progressive policies. 

Sanders, who shares similarities with Warren on progressive policies, has in turn plateaued or dipped in polls. 

The two senators will likely seek to differentiate their policies and tout their own.