Mayor Pete Buttigieg

The 38-year-old rose from being mayor of a midsize Indiana city to mounting a serious Democratic presidential run. He was the first openly gay candidate to win delegates in a presidential race.

The top target is former South Bend mayor Pete Buttigieg. He faced a barrage of attacks as the other Democratic candidates seek to blunt his momentum from a strong showing in Iowa.

Twenty candidates will take the stage over two nights in Miami this week. With front-runner Joe Biden under pressure, can another candidate, like Elizabeth Warren, make the most of the opportunity?