Today on "World News with Charles Gibson":

Primary Preview:
It has been a long haul for the Democratic candidates this primary season and it continues with Tuesday's contests in Oregon and Kentucky. ABC's political team will have the latest on Sens. Barack Obama and Hillary Clinton and their battle for their party's nomination.

Wind Power Town:
Across the nation, many businesses and homeowners are struggling as energy prices continue to rise. In the small town of Rock Port, Mo., however, four windmills are powering the town and keeping energy prices down. ABC's Barbara Pinto has the story of the first and only town to run entirely on wind.

And on our "World News" webcast along with our top headlines:":

'Wii Fit':
A new, highly anticipated Nintendo video game hits stores today. Unlike other video games, "Wii Fit" is intended to make players get off the coach and break a sweat. ABC's Bill Blackmore tests his physical fitness with "Wii Fit."