No (he should go undercover and not make such a big deal)
Yes (he's safer that way)
He should not block the highways. If people hate him so much somewhere, he shouldn't go there in the first place.
Every President does! That's NOT Obama's call -- that's Secret Service!
Leave a Obama is an a hole and everything but that thing isn't really very bad. Many people probably want to assassinate him, and he should protect himself... I guess? O-