McCain won the nomination by winning in states that allowed cross-over voting. His campaign was kept alive by the Dems.
We had some fun doing the same thing voting for H Clintoon to mess up the Dem primaries.
Why are “open” primaries allowed?
Open primaries are allowed to insure no conservatives become candidates. RINOs, GOP elitists and Dems love them.
We don’t really have a two party system any more.