The Democratic ticket will face Repubicans Donald Trump and Mike Pence

This article originally appeared on TIME.com.

Kaine, long an acquaintance of the Clintons and an early endorser, checks those boxes.

Im boring, Kaine told NBC recently when asked about his vice presidential prospects.

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But boring is the fastest growing demographic in the country.

And that is what Clinton is looking for.

I love that about him, Clinton said soon afterward.

He supports a no-fly zone in Syria, something the President has not backed but Clinton does.

Many progressives had called for Massachusetts Sen. Elizabeth Warren to be picked.

-With reporting from Lissandra Villa