GOP pollster says Biden, Sanders are polling low for how well-known they are

Republican pollster Jim Hobart told Hill.TV on Monday that Sen. Bernie SandersBernard (Bernie) SandersButtigieg says he wouldn't be opposed to having Phish play at his inauguration Sanders announces first endorsements in South Carolina Poll: Buttigieg surges into contention with Biden, Sanders MORE (I-Vt.) and former Vice President Joe BidenJoseph (Joe) Robinette BidenButtigieg says he wouldn't be opposed to having Phish play at his inauguration Poll: Buttigieg surges into contention with Biden, Sanders Buttigieg to fundraise in DC with major Obama, Clinton bundlers next month: report MORE should be concerned about poll numbers out of Iowa showing their support from voters in the mid- to high 20s. 

"Sanders got about 49 percent in the Iowa primary in 2016," Hobart, a partner at Public Opinion Strategies, told host Jamal Simmons on "What America's Thinking."

"So that's about half of his voters who are saying, 'OK, now I'm going to go to someone else,'" he continued. 

"Joe Biden is the two-term vice president, very popular Democratic official. If you're not already voting for Joe Biden, what's going to convince you to vote for him?" he said. 

Des Moines Register–CNN–Mediacom poll released on Sunday found Biden with a 2-point lead over Sanders in Iowa. 

Twenty-seven percent of likely Iowa caucus voters said they supported the former vice president, while 25 percent voiced support for Sanders. 

Biden has not officially launched a 2020 presidential campaign.

Sanders, and Biden if he runs, will be competing to stay afloat in a crowded field of candidates including Sens. Kamala HarrisKamala Devi HarrisHarris: Integrity of US justice system 'took a real blow' with Barr's actions Sanders announces first endorsements in South Carolina Poll: Buttigieg surges into contention with Biden, Sanders MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenOn The Money: Inside the Mueller report | Cain undeterred in push for Fed seat | Analysis finds modest boost to economy from new NAFTA | White House says deal will give auto sector B boost Sanders announces first endorsements in South Carolina Poll: Buttigieg surges into contention with Biden, Sanders MORE (D-Mass.) and Cory BookerCory Anthony BookerButtigieg says he wouldn't be opposed to having Phish play at his inauguration Sanders announces first endorsements in South Carolina Buttigieg to fundraise in DC with major Obama, Clinton bundlers next month: report MORE (D-N.J.). 

— Julia Manchester