Democratic pollster Carly Cooperman on Wednesday pointed to Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's 2016 presidential bid to argue that opposing President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE alone is not enough to win an election.

"With Hillary Clinton, we saw that just being against Trump isn't enough," Cooperman, who is a partner at Schoen Consulting, told Hill.TV's Joe Concha on "What America's Thinking."

“There is so much anger and passion in the Democratic Party right now to come out against Trump, but I do not think that will be enough," she continued. “The Democrats need more than just that, and they need to have ideas that they're articulating in terms of immigration and the economy."

Cooperman's comments come as Democrats prepare to face off against Republicans in the November midterm elections, with Republicans seeking to defend a narrow majority in the Senate and fend off Democrats trying to retake the House.

Democratic candidates and incumbents have recently lashed out against the Trump administration's controversial "zero tolerance" immigration policy that led to the separation of migrant families at the U.S.-Mexico border, among other criticisms.

— Julia Manchester