Some 26% of Democrats and independents polled Feb. 17-25 said they believed Sanders was the strongest Democrat in a head-to-head matchup with Trump, compared with 20% who picked billionaire businessman Michael Bloomberg and 17% who named former Vice President Joe Biden.

That was a big change from a month earlier, when 27% of respondents gave Biden the edge, and just 17% thought Sanders could beat Trump.

In the Nevada caucuses, Sanders won the support of a majority of Latino voters and led among most demographic groups broken out by gender, income and political leanings in Nevada. Notable exceptions were those aged 65 years and older, as well as black voters, more of whom supported Biden.

That too could be changing. The same Reuters/Ipsos polling showed that Sanders had overtaken Biden in support among black voters nationally for the first time.