Des Moines (CNN) The influential Iowa political couple Sue and Bob Dvorsky announced their endorsement on Saturday of California Sen. Kamala Harris for the 2020 Democratic presidential nomination.

The endorsement comes just hours before Harris speaks at the Iowa State Fair and midway through her first statewide bus trip across Iowa.

The couple has been influential for decades in Johnson County, a liberal stronghold that's home to the University of Iowa and one of the state's most important counties for Democrats.

"I think she's the one -- the one who is best equipped to bring together the coalitions and bring together our base," Sue Dvorsky told CNN in an interview. "Before you begin to reach out to those folks who are undecided, you have to energize your own base. Our base is young, female, they're people of color and they live all across the country. ... She is the person who can excite that."

Political endorsements make for good headlines for campaigns, especially in the middle of a busy weekend where nearly all the candidates are in Iowa.

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