A Morning Consult poll of 2,631 Democratic primary voters conducted Sunday, the day after Nevada held its caucuses, found 32 percent back Sanders as their first choice for president, widening the gap over former New York City Mayor Michael Bloomberg to 13 percentage points — his biggest national lead of the campaign. Sanders’ support is up 2 points from a Feb. 20 survey conducted the day after the party’s debate in Las Vegas and up 4 points from a Feb. 12-17 survey conducted after the New Hampshire primary.

At the same time, a separate Morning Consult survey of 954 Democratic primary voters also conducted Sunday found 34 percent said Sanders has the best chance of beating Trump, up 5 points from the post-New Hampshire poll and 11 points higher than the share who identified Bloomberg as the most electable Democratic candidate.

The latest Morning Consult tracking poll also finds Sanders leading the field among black voters for the first time as the race moves to South Carolina, the second successive state with a significant black population that former Vice President Joe Biden’s campaign views as a firewall. Thirty-three percent of black Democratic primary voters said they’re backing Sanders, compared with 29 percent who said Biden, within the subsample’s 4-point margin of error.

With Biden at his lowest point since Morning Consult began tracking the race, and no moderate contender solidifying support, Democratic primary voters are increasingly coming to terms with the possibility that Sanders could lead the ticket in November. Among the 69 percent who correctly identified Sanders as the winner in Nevada, a 43 percent plurality said they expect him to be the party’s nominee, up 11 points from the post-New Hampshire poll.