DES MOINES, Iowa (AP) -

A judge says Libertarian presidential candidate Gary Johnson should be listed on the Iowa ballot in November.

Polk County District Court Judge Arthur Gamble says in a ruling filed Tuesday that Libertarians fulfilled requirements of Iowa law to get their candidate on the ballot.

Two Iowa voters last week asked Gamble to review the decision of a panel of three state officials that allowed Johnson on the ballot. The panel says in its decision that Iowa's law isn't clear in its definition of a caucus.

Libertarians say they held a caucus at the Iowa State Fair to get Johnson the ballot. The challengers say there was no caucus.

An appeal to the Iowa Supreme Court is expected but time is running out. Ballots must be printed by Thursday.

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Judge: Libertarian should be on Iowa ballot