Jean,
Entering Canada isn't tough. Getting back to the US is tough. I went over to Canada last month with only a driver's license. Getting over, the Canadian Border guard just said to bring a voter's registration card next time. Coming back into the US, the US Border guard said "Why should I let you back into the US?". He also said if the security level were one notch higher, he wouldn't let me back in. After 5 minutes of lecture and 5 minutes of 'I'm going to make you wait', he let me go. I imagine after the inaugeration and Iraqi elections, the security level will be pretty high for a while. Be ready to open your car trunk and don't bring any beef back into the US. I had a doggie bag from the restaurant where I had lunch and the border guard asked if there were any beef in it. Driver's license plus a birth certificate or voter's registration card should work.
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