S.F. city attorney to file legal challenge to Prop 8

SAN FRANCISCO — The San Francisco City Attorney's office says he plans to challenge the validity of a ballot measure that would change the state constitution to ban gay marriage.

Spokesman Matt Dorsey says City Attorney Dennis Herrera will file the legal challenge in the California Supreme Court.

The first lesbian couple to be married in Los Angeles County after the Supreme Court threw out the gay marriage ban also plans to announce a lawsuit against Proposition 8. Attorney Gloria Allred says that lawsuit will argue that the measure is unconstitutional.