Last week Jay-Z previewed his new song, "Jockin'Jay-Z (Dope Boy Fresh)," during Kanye West's Glow in The Dark tour stop at Madison Square Garden. The entire song was recently leaked online and it finds Jay-Z shouting out presidential candidate Barack Obama. Jay-Z raps, "I rock with Obama but I ain't no politician.....And I chill with the thugs and the gangsters too/ I ain't a Blood but I'm warring with the boys in blue/ Crooked officer, crooked officer/ Why you wanna see me in a coffin, sir?" The chorus features a sample of Run-DMC's Run from the song, "Dumb Girl, which...