The Arizona Secretary of State has this list of candidates for the July 21 primary.

It is noteworthy that three Libertarians qualified for the Libertarian primary ballot for U.S. House (in the First, Second, and Sixth Districts). This is the first time any Libertarian has managed to get on the Libertarian primary ballot for U.S. House since the state changed the law in 2015 and made it very difficult for members of older qualified minor parties to get on their own party’s primary ballot.
The 2015 law does not affect any other qualified minor parties in Arizona, the Green Party and the No Labels Party.

Liberal Currents has this essay by Dennis Lytton that argues that political parties are useful but that they work better without government-administered primaries. The essay also argues in favor of proportional representation.

On July 1, Todd Sloan, an independent candidate for U.S. House in New York’s 24th district, filed a lawsuit in state court to get on the ballot. He needed 3,500 valid signatures. He had enough, except that all the signatures collected by one of his petitioners were invalidated because the petitioner listed a residence address that doesn’t match his residence address on his voter registration form. The lawsuit is filed in Albany County Supreme Court. See this story. Sloan argues that the law doesn’t require the petitioner’s address on the petitions to match the address on the voter registration records.