A spokeswoman for 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) presidential campaign urged Democrats to rally behind the Vermont senator on Wednesday, warning against the prospect of nominating a "hold your nose" candidate for the sake of electability.

Briahna Gray told CNN's "New Day" that a candidate like former New York City Mayor Mike Bloomberg would face difficulties in November similar to those faced by Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE, the Democratic nominee in 2016.

"This is a primary election. And it's important for voters to realize that in a primary election, it's our opportunity to not be stuck with a candidate who is a hold your nose candidate, or a lesser of two evils candidate." Gray said. "We saw what the consequences of that were in 2016."

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"What we don’t need is millions of Americans staying home because they don’t feel like there’s a politician in this race that is speaking to their material interests," she added.

Gray did not mention Bloomberg by name, though her remarks followed a question from co-anchor John Berman that asked the spokeswoman to say "in what ways you think Michael Bloomberg would be better than Donald 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."

Bloomberg and Sanders are set to meet onstage for the first time Wednesday night at the Democratic debate in Las Vegas.