1: Calls mount for Biden to step aside

2: New poll: Michelle Obama outperforms Trump

3: Public demands change at the top

4: Obama's popularity soars in latest survey

5: Will Biden make way for Michelle?

6: Voters prefer Obama over Trump in hypothetical matchup

7: Potential showdown: Michelle vs. Trump

8: Speculation grows over possible Democratic switch

9: Could Michelle Obama be the next president?