Courtesy of Politico, here is a link to presidential primary returns. To get the May 10 primaries, click on either West Virginia or Nebraska on the map. Nebraska has presidential primaries for the Republican, Democratic, and Libertarian Parties.
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The Oregon Independent Party (which is ballot-qualified) and the Minnesota Independence Party (which is not ballot-qualified) announced on May 10 that they will seek to organize all the nation’s centrist minor parties and possibly nominate a presidential candidate. They are planning a national meeting but have not yet decided whether it will be before, during, or after the major party presidential conventions.
Other centrist parties on the ballot include the Independent Party of Delaware, the Independent Party of Florida, the Independence Party of Florida, the Independent Party of Hawaii, the United Independent Party of Massachusetts, the Natural Law Party of Michigan, the Independence Party of New York, the Moderate Party of Rhode Island, the American Party of South Carolina, and the Independence Party of South Carolina. Also, the Reform Party is on the ballot in Florida, Louisiana, and Mississippi. The Oregon Independent Party and the Minnesota Independence Party has not said publicly which parties they are in touch with, but chances are the parties named above are on their list.
On May 10, Public Policy Polling released this general election poll for president, including the Libertarian and Green likely nominees. The results: with Hillary Clinton as the Democratic nominee, Clinton 42%, Trump 38%, Gary Johnson 4%, Jill Stein 2%, other or undecided 13%.
With Bernie Sanders as the Democratic nominee, Sanders 47%, Trump 37%, Johnson 3%, Stein 1%, other or undecided 12%. Thanks to Michael for the link.
On May 9, the Colorado House passed HB 1454, which sets up a presidential primary in future years. This year the major parties in Colorado used caucuses. The bill provides that independent voters may request one of the major party primary ballots. The legislature only has two more days, so it is tough to predict if the bill will pass the Senate.
On May 9, Bill Kristol said there is still a fifty-fifty chance that anti-Trump Republicans will find a viable independent presidential candidate. See this story.