'The Gay Rainbow Across my Electoral Office'

Check out this speech by New Zealand member of Parliament Maurice Williamson following the decision to legalise gay marriage in that country.

What rhetorical devices does he use? How does he use humour? How does he address those with whom he disagrees? Which parts of his speech are pre-planned and which off the cuff? How would you feel if you disagreed with him?

And just enjoy it...