By Jefferson Graham SAN BRUNO, Calif. -- YouTube, the world's most popular video-sharing site, grew to dominate the field with a collection of funny amateur videos, political gotchas and unauthorized TV and movie content. The new YouTube, more popular than ever, has a different look.

By Jefferson Graham SAN BRUNO, Calif. -- YouTube, the world's most popular video-sharing site, grew to dominate the field with a collection of funny amateur videos, political gotchas and unauthorized TV and movie content. The new YouTube, more popular than ever, has a different look.

A YouTube executive says the Internet site is going to branch out from simple video clips to streaming full-length U.S. TV series with commercials.

Politicians have not cherished most of their YouTube moments, those snippets of candid camera video posted on the popular Internet site. Now comes a friendlier YouTube politics.