Cindy and Meghan McCain have posed in ads for the anti-Proposition 8 campaign No H8.

Images of Cindy McCain, the wife of 2008 Republican presidential nominee Arizona Senator John McCain, and their daughter Meghan, a pro-gay Republican, appeared on the group's website on Wednesday.

The No H8 Campaign opposes Proposition 8, the 2008 California voter-approved gay marriage ban that trumped a state Supreme Court ruling legalizing gay marriage in the state.

Both women were photographed with their mouths duct taped and “NOH8” written on one cheek.

Cindy McCain contacted the group to offer her endorsement, the group said in a release.

“The McCains are one of the most well-known Republican families in recent history, and for Mrs. McCain to have reached out to us to offer her support truly means a lot.”

Megan McCain said she was “proud” of her mother in a Twitter message. “I think more Republicans need to start taking a stand for equality,” she said.

Senator McCain, who endorsed a 2008 Arizona ballot initiative that banned gay marriage in the state, said he respected the views of members of his family but remained opposed to gay marriage.

“Sen. McCain believes the sanctity of marriage is only defined as between one man and one woman,” McCain's office said in a statement.