Wow! I KNEW you guys guard your presidents amazingly well, but what we are seeing in Mexico City is amazing...
I've watched lots of "Secret Service" movies (I LOVE THOSE), but experiencing it in real life is different.
We basically can not go anywhere! They closed down a big perimeter, and it happens to be very near downtown, where my girlfriend works. This is the most important part of the city, where all the big businesses are (including 90% of the Ad Agencies and Production Houses), and most important streets pass through there or end there.
Just imagine the traffic-jams!
Obama's helicopters passed right over the building where she works, and she was impressed!
Later, I discovered why she wasn't answering her phone... THE WHOLE agency was in the roof watching the spectacle

Later our presidents will be having dinner at a museum, chat, and then Obama leaves tomorrow.
I can only begin to imagine how much money it costs to guard him so well! But I totally understand there is just no other way. It MUST be done.