Actually, it was Daniel Richards who bit those lines from Eminem. He's not a big name poet...he's some amateur who writes (or plagiarizes, apparently) poetry on the internet for a hobby.
Take a look at this; he has the entire chorus of Deja Vu written down there as well:
http://www.poemhunter.com/poem/mismash/So either Daniel Richards just so happens to use multis in his poetry, and Eminem was so desperate for lyrics that he went on the internet and stole some lines from some average Joe from poemhunter.com...or Richards listened to Relapse and decided to use some of the lines from it in his assortment of poems.
I'm runnin with the ladder like a fireman...