Biden booms in the polls at Bernie's expense - Washington Examiner

1. Biden booms in the polls at Bernie's expense  Washington Examiner
2. Sanders and Biden Circle Each Other, Using Different Rules of Engagement  The New York Times
3. Biden surges in primary polls | TheHill  The Hill
4. CNN Poll: Biden solidifies front-runner status with post-announcement bump  CNN
5. The Twitter gap  The Washington Post
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