If you took the average woman and gave her a quiz on current events, I'd bet the mortgage that her score would be closer to zero than it would to 100. So why are we inundated by female news personalities all of a sudden? The nightly news has become much less of a re-cap of the day's events and more of a "watching out for me" mentality (to borrow the motto of another local news outlet). A story on a family that is filing for bankruptcy isn't news to me, but a feature designed to make us feel something. There! Feeling something! Maybe that's it. As the news becomes less about the news and more about getting you to "feel something" maybe it's thought that a woman can deliver the goods better than a man can.
Or maybe it simply boils down to serving the hottest dish to read the teleprompter scroll because the prettier the gal, the more of the actual people who watch the news (guys) will tune in. Sometimes the obvious answers apply.