Those expecting Joe Biden’s presidential candidacy to flame out any day now will have to keep waiting. According to most political analysts, the former U.S. vice president survived another Democratic debate on Thursday largely unbloodied and unbowed, leaving those on the margins of the race for the party’s 2020 nomination wondering if their time to gain ground on the front-runner is running out. If anything, the third Democratic debate in Houston was notable for how few of the nine other candidates took hard swings at Biden, a marked contrast from earlier debates when his record was more directly challenged. The evening likely left the race fairly much as it was before the debate, with Biden holding a sizeable, but not overwhelming lead over U.S. Senators Bernie Sanders and Elizabeth Warren. None of the other 17 Democratic presidential candidates seeking the chance to battle Republican President Donald Trump in the November 2020 election have more than 4% support, according to the latest Reuters/Ipsos poll released on Wednesday. Biden seemed more vulnerable than ever coming into the debate, facing persistent questions about his age, verbal slip-ups and performance on the campaign trail. But on Thursday, his resilience and forceful defense of his record as a U.S. senator and No. 2 to former President Barack Obama left wide open the question of who else in the field might rise to shake up the race.