The Maine Democratic Party will hold a state convention to choose a new nominee for U.S. Senate. The party hasn’t announced the date of the convention, but it must be held before July 27 to meet the election law deadlline. The party already had one state convention this year, on May 1-2. The process by which the party is settling the details is similar to how all U.S. political parties operated in the 19th century, when parties were more independent of state election laws. It is also a process that resembles how political parties in other nations operate.

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.