Pollster: Sanders would be 'X-factor' if he runs for president

HarrisX CEO Dritan Nesho said on Monday that Sen. Bernie SandersBernard (Bernie) SandersBernie Sanders to sign pledge affirming he will run as a Democrat Overnight Health Care — Presented by National Taxpayers Union — Drug pricing fight centers on insulin | Florida governor working with Trump to import cheaper drugs | Dems blast proposed ObamaCare changes Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon MORE (I-Vt.) would be the "X-factor" among Democratic candidates if he runs for president.

"I would say there's no popular senators out there in terms of gaining majority approval, and this should be worrying to Democrats as they think about 2020," Nesho told Hill.TV's Joe Concha on "What America's Thinking." 

"None of their leading candidates, who are senators, really garner more than the low ten percentage," he continued, referring to Democratic Sens. Kamala HarrisKamala Devi HarrisKamala Harris criticized by Jamaican father over marijuana joke Harris adds key Clinton aide, women of color to 2020 campaign: report Coast Guard lieutenant arrested, accused of planning domestic terrorism MORE (Calif.), Elizabeth WarrenElizabeth Ann WarrenCoast Guard lieutenant arrested, accused of planning domestic terrorism Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon Trump campaign fundraising on Bernie Sanders's M haul MORE (Mass.), and Cory BookerCory Anthony BookerCoast Guard lieutenant arrested, accused of planning domestic terrorism Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon Jussie Smollett officially a suspect in alleged Chicago attack MORE (N.J.), who are all reportedly mulling 2020 presidential bids. 

"Do you put Bernie Sanders [I-Vt.] in that category?" Concha asked. "Because he's an Independent now, but he ran as a Democrat, and he could very easily do that again."

"Sanders is quite popular. If Sanders were to run, he would be the X-factor in the election," Nesho responded. 

Morning Consult poll released in April from the first quarter of 2018 showed Sanders with a 72 percent approval rating, making him the most popular senator in the survey. 

The same poll showed Harris with a 44 percent approval rating and Warren with a 54 percent approval rating. Forty-nine percent of those polled said they approved of Booker. 

— Julia Manchester