Why did Harris pick Walz as her running partner?

The race for the White House has moved up a gear - with both the Trump and Harris campaigns holding rival events in the key battleground states of Michigan and Wisconsin today. Momentum - for the moment at least - seems to be with Harris, who unveiled her running mate Tim Walz last night. For many Americans, it was the first chance to see Walz - the relatively low-profile Minnesota governor - up close.

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