Sen. Cory Gardner this week got his first big name challenger on the Democratic side: former state senator and gubernatorial candidate Mike Johnston of Denver.

Johnston sat down with Kyle Clark to talk about his campaign, education, and why he believes he will fare better with in this Democratic primary compared to his past race for governor where he lost the Democratic primary.

WATCH the 9News video.

> RELATED: Mike Johnston, former candidate for Colorado governor, to challenge Cory Gardner in 2020

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