I think you misinterpretted the progression, the key is E major (although the chords are not posted for the entire song, if they were there would be no mistake, the chords I did post are quite ambiguios to either E or A major). so therefor the progression is Maj1 (E) to minor v (B-) to minor 2 (F#-)to maj.4 (A) to minor 6 (C#-) to dominant 2 (F7, or 5 of the 5) to dom. 5 (B7)...then the song goes back in forth between the minor 2 and dom.5, the chorus is almost entirely based off the Emaj chord.