"In my lifetime, I've seen discrimination," said United States Senator Dianne Feinstein, "and I see it again in Proposition 8." Regardless of your position on marriage, she said, vote against the measure to vote against discrimination.

The measure would be a "terrible mistake for California," she added. "It changes our constitution, eliminates fundamental rights, and treats people differently under the law."

"We are so moved to have the strong, trusted and independent voice of Senator Feinstein joining the chorus of those voting NO on 8," said NO on Prop 8 Campaign Director Patrick Guerriero. "California voters know that Senator Feinstein speaks from the heart and it matters when she urges voters to reject this unfair initiative."

"Senator Feinstein is a trusted and respected voice that will resonate with voters," added Equality California Executive Director Geoff Kors. "She joins the chorus of leaders across California who are calling on voters to reject this unfair initiative."

The entire spot can be viewed below, as posted to YouTube on October 28, 2008.