“Fox News Sunday” anchor Chris Wallace Christopher (Chris) WallaceThe Memo: Warning signs flash for Trump on debates Sunny Hostin slams 'misogynistic, racist, homophobic' Joe Rogan after his offer to moderate debate Fox News host says network 'not committed' to weekly segment after Trump mentions it MORE says that President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) both have grassroots supporters who "would walk through fire for them" — and that former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE and former New York Mayor Mike Bloomberg do not.

"They're the two candidates in this race who have genuine grassroots enthusiasm, and a base — you can argue which base is bigger — that would walk through fire for them. And you can't beat that,” Wallace said on Super Tuesday.

“With Biden and with Bloomberg, we haven't seen that," he continued. "That's why tonight is so important, because we're going to see, particularly with Bloomberg — he hasn't faced the voters in a national race yet. We're going to see whether or not if those half-billion dollars in ads actually get support when people go to the polls."

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Trump and Sanders have drawn the biggest crowds at rallies in the 2020 primary season, and their supporters are vocally active online.

A Gallup poll taken last month shows Trump's approval rating among Republicans at 94 percent.

Sanders currently has the most delegates among the Democratic presidential challengers and appears well positioned to add considerably more in delegate-rich states including California and Texas on Super Tuesday, where voting will take place in 14 states.

But a Morning Consult poll released early Tuesday shows Biden leading with 36 percent support nationally, a 10-point jump since last week following his victory in the South Carolina primary.

Sanders comes in second with 28 percent in the new poll, followed by Bloomberg with 19 percent and Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) at 14 percent.