Democratic presidential candidate Bernard Sanders, who is gaining ground on front-runner Hillary Rodham Clinton, will be among the five White House hopefuls at the party's summer meeting this week in Minnesota.
Democratic presidential candidate Sen. Bernard Sanders is gaining more attention from potential voters in Iowa and New Hampshire due to his straight-shooting style and social agenda. (Associated Press)
Sen. Bernard Sanders has been cashing in on his quarter-century in the Senate as a fierce left-wing warrior in his bid to wean support away from presumed Democratic front-runner Hillary Rodham Clinton, who has been hamstrung by the ongoing scandal involving her private email server. (Associated Press)
Martin Luther King III and Democratic presidential candidate Bernard Sanders commemorated the 50th anniversary of the Voting Rights Act but said more action is needed to make sure poor minorities in the U.S. are not disenfranchised. (Associated Press photographs)
Democratic presidential candidate Sen. Bernard Sanders, I-Vt., speaks at the 2015 International Association of Sheet Metal, Air, Rail, and Transportation Workers (SMART) Conference, Tuesday, July 28, 2015, in Washington. (AP Photo/Jacquelyn Martin)
Democratic presidential candidates, from left, Bernie Sanders, Martin O'Malley, Hillary Rodham Clinton and Lincoln Chafee stand on stage during the Iowa Democratic Party's Hall of Fame Dinner, Friday, July 17, 2015, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)
In this July 9, 2015 photo, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks at the Alliance for Retired Americans 2015 National Legislative Conference in Washington. From his run for mayor of Burlington to numerous campaigns for Congress, Vermont Sen. Bernie Sanders has for more than three decades eschewed traditional party labels in his pursuit of political office, winning election after election as an independent. (AP Photo/Molly Riley)
Democratic presidential candidate, Sen. Bernie Sanders shakes hands with supporters after speaking at a political rally in Madison, Wis., Wednesday, July 1, 2015. (Michael P. King/Wisconsin State Journal via AP)