This is extremely easy, just listen to how the bass goes in the beinning for the right rhythm.


G | ------------------------------------|
D | ------------------------------------|
A | ---------------------------3-33-----|
E | --3-33--2-22--0-00------------------|


that's it, its just over and over again, it speeds up a little bit when Kathleen repeats 
over and over again but aside from that it stays exactly how it does in the intro