Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE's (I-Vt.) national press secretary hammered former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE on Thursday, arguing the billionaire candidate would not be able to defeat President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in a general election.

In an interview, Briahna Joy Gray told Hill.TV hosts Saagar Enjeti and Krystal Ball that Bloomberg's campaign lacked the on-the-ground enthusiasm necessary to win in November.

"You cannot ignore the fact that Bernie Sanders has the fundraising engine that can keep us going all the way, and actually compete with someone like Donald Trump who has all the lobbyists' and special interests' money at his back," Gray said.

"You can't compete with the MAGA hat-wearing crew if you are a milquetoast candidate like Michael Bloomberg," she added.

Her comments come after Bloomberg was sharply criticized by every Democrat onstage during Wednesday's presidential debate in Las Vegas, just days ahead of the Nevada caucuses and the former mayor's first appearance on the debate stage since jumping into the race in late November.

During the debate, Bloomberg faced tough questions from fellow Democrats such as Sanders and Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) over his earlier support of stop and frisk, as well as workplace issues at his company, Bloomberg L.P.