Senator Bernie Sanders ran for president in 2016 on the Democratic ticket. Expected to be an "also ran" candidate, Sanders started the campaign at less than 3% in initial polls. By the end of summer 2015, he was a legitimate contender, and national polls increased up through the primaries. Notable about his campaign was its ability to break records again and again in the most attendees at a political campaign rally. He won multiple primary states, but narrowly lost others includin Iowa and California (California by less than 5%). Although he tchnically lost the primaries, he refused to concede to allow his campaign's delegates to attend the Democratic National Convention and give them an opportunity to become more involved in the political process. Democrat "super delegates" historically vote in favor of the nominee that won the most primary states, and maintained that precedent by putting their weight behind Hillary Clinton at the 2016 Democratic National Convention. Sanders officially conceded when state delegate vote tallies were announced at the convention.