Newsies hope to hold viewers' votes

The most recent Nielsen ratings showed that politics -- and nearly wall-to-wall coverage of it -- have been very good for CNN and MSNBC. And as the country heads toward a historic election in an increasingly charged atmosphere, the cablers' good fortunes will likely continue. But what happens when the voting ends Nov. 5? Will politically-oriented programming continue to pay off for CNN and MSNBC? Or is the viewer appetite for politics the equivalent of an irrationally exuberant stock market, with a nasty ratings "correction" all but assured once the race is over?