Journalist Emma Vigeland said on Thursday that former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE’s strong support is based on “hot air” and nostalgia stemming from his time in the Obama administration.

“I would argue that Biden’s support is kind of based on hot air and nostalgia about the Obama administration and the return to normalcy,” Vigeland, a correspondent and producer at the left-leaning The Young Turks, told Hill.TV.

“But once voices start to get heard, I think that’s going to matter a lot less,” she continued.

Biden's campaign did not immediately reply to a request for comment from The Hill.

Vigeland noted Biden and fellow Democratic contender Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) are already neck-and-neck in key swing states like Iowa.

“The fact that Biden and Bernie Sanders are pretty much tied in Iowa, which is the state that’s going to start the dominos falling, I think that kind of speaks to what I’m talking about,” she said.

According to a new poll conducted by Iowa Starting Line/Change Research poll, Sanders and Biden were tied at 24 percent among the Democratic voters in the state.

Biden, however, is still the primary field’s frontrunner, topping nearly every national poll since he announced his White House bid in April.

The former vice president also boasts millions in campaign donations. Within the first 24 hours of launching his presidency, his campaign announced that he raised $6.3 million — the most out of any of his Democratic opponents.

—Tess Bonn