Sanders spokeswoman: A lot of candidates will have to answer for their past

A spokeswoman for Sen. Bernie SandersBernie Sanders2020 Dems slam Trump decision on West Bank settlements Sanders doubles down on Bolivia 'coup,' few follow suit Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE (I-Vt.) on Thursday said that many of the progressive senator’s fellow 2020 contenders will have to answer for their past stances on various issues.

“A lot of candidates are going to have to answer for their histories — both in office and before they joined political office,” Briahna Joy Gray, told Hill.TV.

Gray did not mentions any candidates by name, but said she's not worried about Sanders, saying his “longevity is a selling point instead of something that you have to excuse.”

“We have a candidate who has been in office so, so long and yet at the same time doesn’t have all of those foibles,” she told Hill.TV, citing his long-standing support of civil rights.

Sanders is behind in the polls to former Vice President Joe BidenJoe Biden2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE, whose past stance on the Iraq War and the 1994 crime bill have both come under attention. Biden also took criticism from Sen. Kamala HarrisKamala Devi HarrisKamala Harris endorses Christy Smith in bid to fill Katie Hill's seat Poll: Biden holds 11-point lead over Warren in Arizona Poll: Biden and Warren are neck and neck in California MORE (D-Calif.), another presidential hopeful, during the first presidential debate for his past opposition to federal busing of students.  

Sanders will take the debate stage tonight in Houston at Texas Southern University alongside Biden and fellow progressive Sen. Elizabeth WarrenElizabeth Ann Warren2020 Dems slam Trump decision on West Bank settlements Sanders doubles down on Bolivia 'coup,' few follow suit Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE (D-Mass.). Those three candidates have been leading most recent national polls, along with surveys in Iowa and New Hampshire.  

—Tess Bonn