(CNN) - Alaska Gov. Sarah Palin said Friday it was a "weak, convenient excuse" for talk show host David Lettermen to claim his controversial joke made earlier this week targeted Palin's older daughter, and not 14-year-old Willow.
"My 14-year-old was there with me at the game. She was the only one there with me," Palin said Friday in an interview with CNN's Wolf Blitzer.
Letterman joked Tuesday that Palin's "daughter was knocked up by Alex Rodriguez" at a recent Yankees game. He admitted the following night that the joke was in "poor taste," but he insisted the line was in reference to 18-year-old Bristol, who gave birth to a boy in December.
"We were, as we often do, making jokes about people in the news and we made some jokes about Sarah Palin and her daughter [Bristol]... and now they're upset with me," Letterman said.
"These are not jokes made about her 14-year-old daughter. I would never, never make jokes about raping or having sex of any description with a 14-year-old girl," he said.
"Am I guilty of poor taste? Yes. Did I suggest that it was okay for her 14-year-old daughter to be having promiscuous sex? No."
Palin was unimpressed with Letterman's explanation. "Regardless of which daughter it was - inappropriate," she said Friday.
The former Republican vice presidential nominee said she will "always forgive whomever is asking for forgiveness," but noted that what she's upset about goes beyond Letterman's "sexist, perverted joke."
"This insinuation that it's ok, that it's acceptable to talk like that and then that it's acceptable for the media to not provide the American public, the listeners, the readers the full context of that joke," she said, adding that it's also a "sad commentary on what Americans are fed in terms of full news."
Watch Palin's full interview with Wolf Blitzer this afternoon at 4 and 6 p.m. ET on The Situation Room.