Tim Walz speaks at Democratic National Convention

Vice presidential nominee Tim Walz and former President Bill Clinton are headlining the Democratic National Convention on Wednesday, the third day of the party's choreographed rollout of a new candidate, Kamala Harris, and her pitch to voters.

Walz faces dual tasks in his speech in Chicago. The Minnesota governor, who has become known among supporters as a folksy, Midwestern teacher, coach and dad, will introduce