http://abclocal.go.com/kgo/news/040605_nw_passport.html
Passports Required To Canada, Mexico
Apr. 6 (ABC7) — If you don't have a passport, you might want to consider getting one soon.
The Homeland Security Department wants Americans traveling to Canada and Mexico to show a passport when they return to the US.
The guidelines would be phased-in by 2008, to give people a chance to apply for passports. Only about 20-percent of Americans have one.
The rules would also apply to Bermuda, the Caribbean, and Panama.