Former Colorado Gov. John Hickenlooper addresses the crowd from the main stage at the Blue Sneaker Ball to celebrate the inauguration of Gov. Jared Polis at the Denver Museum of Nature and Science on January 8, 2019. (Kathryn Scott, Special to The Colorado Sun)

John Hickenlooper expected to end his 2020 presidential bid on Thursday

It's unclear whether Hickenlooper will now challenge Colorado Sen. Cory Gardner, who is considered the country's most vulnerable Republican senator

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