KEY POINTS
  • Bernie Sanders continues to cut into Joe Biden's lead in national polls ahead of the first-in-the-nation Iowa caucuses.
  • Meanwhile, Mike Bloomberg finds himself tied with Pete Buttigieg in a national average after shelling out more than $200 million on campaign ads.
  • State-level polls in Iowa, New Hampshire and Nevada show close contests, while Biden has a commanding lead in South Carolina polls.
Democratic presidential hopefuls Former Vice President Joe Biden (L) and Vermont Senator Bernie Sanders participate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020.

President Donald Trump has spent a lot more of his time lately worrying about Bernie Sanders and Mike Bloomberg.

The latest 2020 Democratic presidential primary polls gives some hints why.