Shamol,
It's simple.
Have anybody tried to kill Bush so far??Why??
Because they know, they don't have to!!He himself basically cripled the US economy.
Obama has been already got targeted!That means he is going to be a great leader.
Only the great leaders got killed so far>
:-Kennedy,Lincoln,Martin Luther King,Mahatma Gandhi..................
Obama will not only be good for US but also for the world economy.