More good news for gay marriage supporters: A survey released Tuesday by Public Policy Polling found that a narrow majority of Washington state voters support same-sex marriage.

That's the first time since PPP starting polling on the issue last year that more than 50 percent of those surveyed in Washington were in favor of gay marriage.

In the latest poll, 51 percent said they believe gay marriage should be legal while 42 percent believe it should be illegal.

In May 2011, survey respondents supported gay marriage 46-44. Support grew by last February to 49-44.

Voters in November will decide Referendum 74, which will determine whether to retain or reject the state's new gay marriage law.

The PPP survey also found that voters support an initiative to legalize marijuana, 50-37. The measure, I-502, also will appear on the November ballot.

The poll surveyed 1,073 Washington voters from June 14-17. Its margin of error is plus or minus 3 percentage points.