From the NYT:

One late night last November, Mitt Romney, campaigning in Greenville, S.C., was approached by three young women in bright matching outfits looking for a hug. Mr. Romney, thinking they were cheerleaders from nearby Clemson University, obliged.

The young women worked at a Hooters restaurant. Unfortunately for Mr. Romney, Scott Conroy, who works for CBS News, filmed the hug with his Sony hand-held camera and sent the image to the television network’s political desk in New York. The video was published online the next morning. “You’re standing there doing your job, and all of a sudden Mitt Romney’s hugging Hooters girls. It’s one of the times you’re glad you’re filming,” Mr. Conroy recalled.

Mr. Conroy, whose job title is “off-air reporter,” (because he does not normally appear on television) is one of many young journalists hired by the networks to follow the candidates across the country, filing video and blog posts as they go. Originally hired to cut expenses — their cost is a fraction of a full television crew’s — these reporters, also called “embeds,” have produced a staggering amount of content, especially video. And in this election cycle, for the first time, they are able to edit and transmit video on the fly.

As a result, the embeds have changed the dynamic of this year’s election, making every unplugged and unscripted moment on the campaign trail available for all to see. One particular video shot of American flags tilting over behind Hillary Rodham Clinton last November has been viewed more than 300,000 times on the ABC News Web site. A video of the Fox News host Bill O’Reilly shoving a member of Barack Obama’s staff at a New Hampshire campaign rally has drawn almost 150,000 views on YouTube.