Hillary Clinton speaking to crowds at Iowa rally

The speaker introduces their presidential campaign in Iowa, emphasizing the importance of engaging with the public in personal settings like living rooms and union halls. They express a desire to renew America's promise and highlight the significance of personal conversations. The speech concludes with acknowledgments to the venue and individuals present.

What is the significance of Iowa in the context of the speech?

What does the speaker mean by 'renew the promise of America'?