The lead part is just up and down the G string with an open D string.  Message me 
if you want specifics.

Intro: D

Verse 1:
D (7 fr.)
Waging war against my sins
It's been a while since I talked to him
I keep a bible by my bed
But it's been a while since it's been read

    G   D/F# Em        G   D/F#   A            D
I don't know why I've let things come this far

D (7 fr.)
It's hard to ask him to forgive
When you live a life you don't want to live
On your knees and crawling home
I never feel alone

    G   D/F# Em        G   D/F#   A            D
I don't know why I've let things come this far

Chorus:
   Em         D/F#   G                D
Guardian Angel    watching over me tonight
     Em                        D/F# G
I'm sorry you got stuck with me
                           D
But I'm glad you're by my side


Verse 2:
D (7 fr.)
It's not good to drink alone
But I do every night when I get home
There's a lot of things I need to get off my chest
But it's hard to play with whiskey on my breath

    G   D/F# Em        G   D/F#   A            D
I don't know why I've let things come this far

(D7)
There was this girl she was a friend of mine
We used to talk all the time
She said she'd love to let me in
But she thinks I'm high again

    G   D/F# Em        G   D/F#   A            D
I don't know why I've let things come this far

Chorus (x2)

End: D (7 fr.)