South Carolina mayor says conventional wisdom will be tested in 2020 Dem primaries

Conventional wisdom will be put to the test in the 2020 Democratic primaries, according to Columbia, S.C., Mayor Stephen Benjamin (D).

"I think all bets are off the table in [that] no one who's smart will take anything for granted," Benjamin told Hill.TV's Jamal Simmons on "Rising."

"They'll come and spend the time learning the state, talking to them about what's important," he added in a Tuesday interview that aired the following day.

"I think some of the conventional wisdom will be tested this time," he said, referring to the primary season as a whole.

South Carolina's will be the third primary contest in 2020, after the Iowa caucuses and the New Hampshire primary.

"Everyone is going to have to come and grind it out," he said. "Julián Castro was a fantastic HUD [Housing and Urban Development] secretary. He was very good, I will tell you, to the people of Columbia during his tenure in the Obama administration." 

Castro launched his White House bid earlier this month.

Benjamin also praised other candidates and potential contenders, including Sens. Kirsten GillibrandKirsten GillibrandExpanding our health force can save lives and create jobs simultaneously Sanders offers bill to tax billionaires' wealth gains during pandemic Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-N.Y.) and Elizabeth WarrenElizabeth WarrenKamala Harris: The conventional (and predictable) pick all along On The Money: McConnell says it's time to restart coronavirus talks | New report finds majority of Americans support merger moratorium | Corporate bankruptcies on pace for 10-year high Hillicon Valley: Facebook removed over 22 million posts for hate speech in second quarter | Republicans introduce bill to defend universities against hackers targeting COVID-19 research | Facebook's Sandberg backs Harris as VP pick MORE (D-Mass.), former Vice President Joe BidenJoe BidenNAACP seeks to boost Black voter turnout in six states Biden touts Trump saying Harris would be 'fine choice' for VP pick Kamala Harris: The conventional (and predictable) pick all along MORE and former New York City Mayor Michael Bloomberg.

The field of presidential hopefuls is expected to grow in the coming weeks. 

A Harvard CAPS/Harris Poll survey released exclusively to The Hill on Tuesday found that 43 percent of respondents said they would cast their vote for a Democratic candidate in 2020.

— Julia Manchester