In Colorado, two millennial candidates are thinking about A.I.

© Matthew Defeo for The New York Times

MAGA Inc. is now flooding the social media platforms with targeted ads as it seeks to turn out Republicans amid the president’s historically low approval ratings.

© Eric Lee for The New York Times

MAGA Inc. is now flooding Facebook and Instagram with targeted ads as it seeks to turn out Republicans amid the president’s historically low approval ratings.

© Eric Lee for The New York Times

A Republican ad features Amy Acton’s estranged mother calling her daughter a liar. The two have not spoken since Dr. Acton’s mother backed her husband after his arrest on rape charges.

© Kenny Holston/The New York Times

The liberal pro-Israel advocacy group’s ads denouncing incumbents in Iowa and Pennsylvania put it at odds with the larger organization for the first time.