(CBS) Casey Knowles didn't much like a recent campaign commercial for Hillary Clinton - even though she's in it as a sleeping 8-year-old.

After all, she's about to turn 18 now and is a big supporter of Barack Obama.

The well-known Clinton ad aired in Texas before last week's vote and implied a lack of experience on Obama's part. It showed an exterior of a Colonial-style home and old stock footage of Knowles sleeping in bed. A narrator describes a phone ringing in the White House: "It's 3 a.m. and your children are safely asleep. Who do you want answering the phone?"

The file footage was originally shot for a railroad company advertisement. The Clinton campaign bought it from Getty Images.

"I mentioned that we should make a counter ad, me and Obama, against Hillary," she said. "They thought that was really funny. They actually might take me up on it."