What I gather from your post is that the Passport Card can be used to enter the United States. The OP's question was about entering other countries, which in most cases I believe require actual passports. The Bahamas have traditionally been an exception to that, having in the past only required some ID like a valid driver's license or something similar to prove you are from the USA. That may have changed since you now can't reenter the States from the Bahamas without a Passport or, apparently, at least a Passport Card.
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Last edited by FSMike; 05-17-2010 at 12:24 AM.