1: Harris steps into the spotlight as Democratic frontrunner after Biden exits race.

2: With Biden out, Harris faces new challenges in campaign for presidency.

3: Support for Harris surges following Biden's withdrawal from presidential race.

4: Democrats rally behind Harris as she becomes party's new hope for 2020.

5: Harris emerges as leading candidate after Biden ends his bid for presidency.

6: Harris addresses nation after Biden's departure, vows to continue fight for Democratic nomination.

7: Democratic voters look to Harris as next best chance to defeat Trump in 2020.

8: Harris gains momentum as top choice for Democratic nomination post-Biden.

9: Harris solidifies her position as Democratic front-runner following Biden's decision to bow out.