Article snippet: The race for the Democratic presidential nomination is both competitive and fluid less than 100 days before the Iowa caucuses, with a stable trio of leading candidates and a fourth — Pete Buttigieg, the mayor of South Bend, Ind. — now rising above a dozen others in the low single-digits, according to a Washington Post-ABC News poll. Democrats see former vice president Joe Biden as the strongest leader among the top candidates and also say he has the best chance of defeating President Trump. But he holds no advantage on five other attributes, including policy issues, bringing needed change and being mentally sharp. He remains atop the field, with Senators Elizabeth Warren of Massachusetts and Bernie Sanders of Vermont trailing, Warren within the margin of error. Meanwhile, the poll finds significant concerns about Sanders’ fitness in the wake of his heart attack last month, with more than 4 in 10 Democrats saying he is not in good enough health to serve as president. A majority of Democrats say they have not firmly made up their minds on whom to support, with about 1 in 10 having no current preference and about half of Democrats who do support someone saying they would consider supporting another candidate. That has added an air of uncertainty over a race that to this point has been somewhat stable. Among Democratic-leaning registered voters, 28 percent would support Biden if their state’s primary or caucus were held today, while 23 percent support Warren and 17 ... Link to the full article to read more