If you're playing with someone, try using C/G instead of C for a nice bass sound all around. 
Also, play around with the bass notes when changing from C to Am (C - C/G - C/F# - C/E, etc).
Enjoy playing this great song :)

C                             Am
I've got news for you: we all know
F                                        C
Stop acting like you've never heard this before
C                                Am
Blood on your hands leaving your mark
F                                              C
It's when you cross the line where the trouble starts
C                                    Am
Michael you had a voice that learned to lie
F                                               C/G
It was the day that I fell apart that we almost died
C                            Am
I would like to think people change
F                                         C
But I've seen no evidence or the point it made

F       C         E        F
You can come back when you need

C                                 Am
Michael I've had enough it's time to go
F                                           C
They're making it clear they don't want you here
C                                Am
You can throw your voice all you like
F                                 C
I don't want to see you return anytime
C                            Am
Shake off your doubt, grab a hold
F                                         C
Sometimes the hardest part is letting you go
C                                 Am
You can always come back when you need
F                                     C
I'll leave the light, leave the light on

F       C         E        F
You can come back when you need