Today the 2nd circuit affirmed a 2003 decision of a US District Court, and agreed that New York state must let voters register as members of parties that are not qualified parties. Green Party of NY v NY State Bd. of Elections. Now, parties that manage to place a statewide nominee on the ballot will have the right to a list of all voters who register into that group. At the present time, groups that may receive such a list are the Green, Libertarian, Socialist Workers Parties (of course, the qualified parties of New York also have access to such a list; they include the Democratic, Republican, Independence, Conservative and Working Families Parties).
The decision will be useful in a planned lawsuit against Iowa, one of only two states that still will not permit anyone to register into a nonqualified party (the other such state is Kansas). There are also a handful of states that physically permit voters to register into unqualified parties, but refuse to keep a tally of such voters).