DES MOINES, Iowa (AP) — Martin O’Malley is returning to the state that introduced him to presidential politics three decades ago, when he played guitar and knocked on doors for Gary Hart.

This time he’ll be in Iowa as a Democratic presidential candidate, if he announces a White House bid Saturday as expected.

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Iowa could well determine whether O’Malley’s longshot challenge to Hillary Rodham Clinton for the Democratic nomination takes roots or fades away.

The former two-term Maryland governor has been well received in recent trips to Iowa and New Hampshire. But Clinton holds a commanding advantage. And O’Malley faces competition for liberal support from Vermont Sen. Bernie Sanders in the nomination race.

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O’Malley is making his announcement in Baltimore, where he served as mayor, before campaigning in Iowa later Saturday.

(Copyright 2015 by The Associated Press. All Rights Reserved.)

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