On November 18, U.S. Senator Amy Klobuchar became the first Democrat to file for the Ohio Democratic presidential primary. She needed 1,000 signatures for herself, and smaller petitions for her candidates for Delegate to the national convention.
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For well-known presidential candidates seeking a place on a major party presidential primary, Virginia has the toughest rules. The state requires 5,000 signatures.
On November 18, Pete Buttigieg became the first Democratic presidential candidate to submit a petition. His petition has approximately 12,000 signatures.
The Colorado Secretary of State web page keeps a list of presidential primary candidates. The list is updated when someone files. The deadline is January 3. Candidates merely need a filing fee.
As of November 19, here is the list. There are six Democrats and three Republicans.
The Arizona Libertarian Party is ballot-qualified in Arizona, and could have a presidential primary if it wished. But the party has informed the Secretary of State that it doesn’t want a presidential primary.
In 1996, the Arizona Democratic Party and the Arizona Libertarian Party jointly won a lawsuit in state court, establishing that if they don’t want a presidential primary, they can prevent such a primary. Later the legislature codified that any party is free to cancel a presidential primary. In 2020, the Arizona Republican Party has also cancelled its presidential primary.
Candidates get on an Arizona presidential primary ballot by showing that they are on in at least two other states’ presidential primaries. So far Pete Buttigieg is the only Democratic presidential primary candidate who has filed in Arizona.
The Peace & Freedom Party has asked the California Secretary of State to list Howie Hawkins and Gloria La Riva on its March 2020 presidential primary ballot.