HONOLULU — Opponents of an election designed to be a significant step toward Native Hawaiian self-governance are asking the U.S. Supreme Court to block votes from being counted in what they argue is an unconstitutional, racially exclusive process.“This court’s intervention is urgently needed,” said the request filed Tuesday with Justice Anthony Kennedy, who can act on his own or get his colleagues involved.Native Hawaiians are voting to elect delegates for a convention next year to come up with a …