There's a limit to how far John McCain will go to win over young voters. Wearing a dress on national television crosses that line.

The 71-year-old grandfather and Republican presidential contender said he hopes to use his appearance this week on "Saturday Night Live" to reach out for the youth vote.

"I think Senator Obama has done a very good job with young voters; we have to do a good job as well," McCain said, referring to the leading Democratic presidential contender, Sen. Barack Obama of Illinois.

McCain said he expects the show's writers to decide how to best use him, but he declared there will be no reprise of the cross-dressing appearance once made by former New York mayor Rudy Giuliani.

"Ah, no," the Navy veteran said when asked if he would agree to wear a dress.

McCain has already targeted young voters by participating in a televised youth townhall meeting, as well as a popular campaign blog being written by his daughter Meghan. The 23-year-old is on the campaign trail with two girlfriends who take pictures and shoot video. The trio is known collectively as the "McCain Blogettes."

"I think she's been a great asset. And like a lot of young people, Meghan and I have our differences on specific issues, but that makes for healthy conversation around the dining room table," the Arizona senator said.

McCain previously hosted an episode of "Saturday Night Live," but this week those duties on the NBC-TV show are being handled by comedian Steve Carell. The senator will be confined to a cameo appearance that will be rehearsed between 4 p.m. Saturday and airtime at 11:35 p.m.

(with wire services)

This video is from NBC's Saturday Night Live, broadcast May 17, 2008.

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During a Saturday Night Live second clip, John McCain joked that not having a Democratic nominee by the convention would be "crazy exciting."

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