When prime-time cable news ratings for the second quarter of 2008 are officially released next week, they will show that Fox News reclaimed the top spot among viewers in their mid-20s through mid-50s, those of greatest interest to news advertisers, according to estimates from Nielsen Media Research.

During the first three months of the year, by contrast, CNN drew so many viewers on big Democratic primary nights and for several presidential debates that it vaulted over Fox News for the first time in six years.

But the back-and-forth these last few months masks a more ominous trend for Fox News, particularly as its gears up to cover the general election campaign. The most dominant cable news channel for nearly a decade and a political force in its own right, Fox has seen its once formidable advantage over CNN erode in this presidential election year, as both CNN and MSNBC have added viewers at far more dramatic rates.

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