My understanding of the vision is as follows:
 

He said:   "this has been revealed to you, that you
may know, the first bite has been, the second is yet
to come, and the third will be its destruction."
 

The 1st snake represents Al Quaeda------Because he
said "the first bite has been"-----and it was none
other than Al Quaeda that attacked America and caused
Bush to go after the group and eventually led toppling
Saddam Hussein.
 

The 2nd snake I believe represents Iran------Iran will
cause some catastrophe in the middle east that will
cause Bush to go after them in great fury-----this
event could even happen b/4 the election.
 

The 3rd snake I believe represents Russia, China,
North Korea, and a host of Muslim nations banded
together to destroy America------by because I don't
believe any single nation could destroy America,
 

This is my understanding of the vision and time will
make everything even more clearer. Jesus Is Lord!
 

In Christ,