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 SandersBernie SandersSanders denies tweet about corporate Democrats was dig at Warren Sanders denies tweet about corporate Democrats was dig at Warren Democrats asked to create ideal candidate to beat Trump pick white man: poll MORE (I-Vt.) and former Vice President Joe BidenJoe BidenBiden invokes Ted Kennedy in defending remarks about working with segregationists Biden invokes Ted Kennedy in defending remarks about working with segregationists Booker hits Biden's defense of remarks about segregationist senators: 'He's better than this' 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 HarrisDemocrats asked to create ideal candidate to beat Trump pick white man: poll Democrats asked to create ideal candidate to beat Trump pick white man: poll Biden defends remarks about segregationist senators: 'Apologize for what?' MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenSanders denies tweet about corporate Democrats was dig at Warren Sanders denies tweet about corporate Democrats was dig at Warren Warren: 'On Juneteenth and every day: Black lives matter' MORE (D-Mass.) and Cory BookerCory Anthony BookerBooker hits Biden's defense of remarks about segregationist senators: 'He's better than this' Booker hits Biden's defense of remarks about segregationist senators: 'He's better than this' Biden defends remarks about segregationist senators: 'Apologize for what?' MORE (D-N.J.). 

— Julia Manchester