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 SandersSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Biden hires Clinton, O'Rourke alum as campaign's digital director MORE (I-Vt.) and former Vice President Joe BidenJoe BidenSenate gears up for battle over witnesses in impeachment trial Conservative group hits White House with billboard ads: 'What is Trump hiding?' Democrat representing Pennsylvania district Trump carried plans to vote to impeach  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 HarrisOvernight Health Care — Presented by That's Medicaid — House passes sweeping Pelosi bill to lower drug prices | Senate confirms Trump FDA pick | Trump officials approve Medicaid work requirements in South Carolina Sanders endorses Young Turks founder Cenk Uygur for Katie Hill's former House seat Kamala Harris dropped out, but let's keep her mental health plan alive MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenSaagar Enjeti says Buttigieg's release of McKinsey client list shows he 'caved to public pressure' On The Money: Lawmakers strike spending deal | US, China reach limited trade deal ahead of tariff deadline | Lighthizer fails to quell GOP angst over new NAFTA Bill Weld: As many as six GOP senators privately support convicting Trump MORE (D-Mass.) and Cory BookerCory Anthony BookerTrump neck and neck with top 2020 Democrats in Wisconsin: poll Booker says he will not make December debate stage White House makes push for paid family leave and child care reform MORE (D-N.J.). 

— Julia Manchester