The first Democratic debate has shaken up the race for the Democratic nomination. Compared to June’s national poll, former VP Joe Biden extended his lead, Sen. Bernie Sanders lost ground, Sen. Kamala Harris doubled her support, and Sen. Elizabeth Warren held steady. Despite Biden losing 4 points of his support from 34% to 30%, he extended his lead in the Democratic primary from 7 points in June to 15 points, as his main rival, Sanders dropped 12 points to 15% from his June number of 27%. Harris saw her numbers improve 8 points to 15%, and Warren ticked up one point from June to 15% of the vote, creating a three way tie for second. The data was collected July 6-8 and has a margin of error of +/- 4.4%.