Check out my video on youtube of how to play the song with these chords: 
http://www.youtube.com/watch?v=cGCGQzeL_yY

You can just use these four chords throughout the whole song and it sounds pretty good:

Abm: 422444
E: 022100
B: 224442
Bbm: 688666

Abm                        E
I wanna hold em' like they do in Texas Plays
B                                Bbm
Fold em' let em' hit me raise it baby stay with me (I love it)
Abm                         E
Luck and intuition play the cards with Spades to start
    B                                    Bbm
And after he's been hooked I'll play the one that's on his heart

Abm                    E
Oh, oh, oh, oh, ohhhh, ohh-oh-e-ohh-oh-oh
B                  Bbm
I'll get him hot, show him what I've got
Abm                    E
Oh, oh, oh, oh, ohhhh, ohh-oh-e-ohh-oh-oh,
B                  Bbm
I'll get him hot, show him what I've got

Abm
Can't read my,
E
Can't read my
                    B
No he can't read my poker face
Bbm
(She's got to love nobody)
Abm
Can't read my,
E
Can't read my
                    B
No he can't read my poker face
Bbm
(She's got to love nobody)

Abm               E
P-p-p-poker face, p-p-poker face
(Mum mum mum mah)
B                 Bbm
P-p-p-poker face, p-p-poker face
(Mum mum mum mah)