- 2020 Iowa poll: Biden is ahead, but Warren and Buttigieg are risingVox.com
- Biden lead slips in latest Iowa poll; Sanders, Warren, Buttigieg are nearest contendersFox News
- Biden slumps, Buttigieg soars: 6 takeaways from benchmark Iowa poll | TheHillThe Hill
- Democratic Hopefuls Fan Out Looking for Elusive Edge in IowaBloomberg
- Barack Obama’s and Jimmy Carter’s Iaunch pad may have lost its magicCNN
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