[OldNavyVet]

Anybody travelling out of country, Mexico and Canada excluded, needs a US Passport. And so it should be for voters...

Every US citizen with an ID card.

Obama included.

[rolling_stone]

US citizens Entering the US from Mexico or Canada now requires a passport or a passport card. Illegal aliens can still sneak across without ID.

http://travel.state.gov/passport/ppt_card/ppt_card_3926.html