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Between 21 and 29. and does not recommend cervical cancer screening for women under 21 even those who are sexually active. but the college does stress that women should be vaccinated against the hpv virus that causes cervical cancer. and just because women don't need a pap test every year, that does not mean that they should put off seeing their gynecologist for other health reasons. i'm dr. timothy johnson. >> isn't that something? apparently cervical cancer -- worldwide cervical cancer is the third most common type of cancer in women. of course, much less common in the united states because ...

>> they know a lot and made assumptions about you. >> reporter: they're not at your door by accident? >> not at all. we are way past accidents. >> reporter: which means campaign ads are popping up in the unlikeliest places, like the obama ads in video games. >> one of the variables of obama's campaign in 2008, was to predict support for him, presence of a teenager in the household. they went out and found video games where you can buy ads in the video games and bought early vote reminders. >> reporter: does it work? there is nothing to show definitely that these tactics put them over the finis...