According to her Facebook profile, Giuliani's 17-year-old daughter, Caroline, is a Barack Obama supporter. Her profile said she belonged to Obama's Facebook group. But she left that group Monday morning after the online magazine Slate started looking into it.
The teenager is Giuliani's daughter with his second wife, Donna Hanover. She'll attend Harvard this fall. On her profile, which uses a slightly different last name, she described herself as having liberal political views.
Her 21-year-old brother, Andrew, has said his relationship with his father became distant after the parents' messy divorce and his father's marriage to Judith Nathan.
Andrew previously told The New York Times that he would be too busy working on his golf game to participate in his father's presidential campaign.
The New York Daily News reported that Giuliani attended his daughter's graduation in May — sitting in the last row, and leaving without speaking to her.
"It's not the first time children of a presidential candidate have been estranged personally or politically from their parent," said CBSNews.com Senior Political Editor Vaughn Ververs. "Rudy Giuliani's bitter, and very public, divorce from Donna Hanover — mother of Caroline and Andrew — has left some very visible scars which won't make social conservatives within the Republican Party any more comfortable with his candidacy, but is unlikely to be a decisive issue."