Nas (or his producer) completely misrepresented Pac's message on Black President.
You're missing the point Pac tried to make. It's not that he was saying there wouldn't be a black president. He was saying it wouldn't be right as long as black people are still treated unfairly overall by the justice system.
"And
although it seems heaven sent
We ain't ready, to see a black president
It ain't a secret,
don't conceal the fact
The penitentiary's packed, and it's filled with blacks''
Note how the bolded describes perfectly the false sense of euphoria when Obama was elected like everything would be all right from now on. The line is more relevant than ever. People stay misrepresenting Pac in the media though, even Nas (smh).
That's the difference between Pac's social commentary, and Nas' social commentary too. Nas looks at the surface and gets caught up in the hype while Pac was more militant and critical of political leadership. Though to be fair to Nas, he kind of points to Pac's real meaning of the lyric with the way he end his second verse and lets it lead into the chorus.
you obviously didn't actually listen to Black President. the whole thing was about being critical, about not blindly following and losing site of whats going on in the ghettos of america. It was both hopeful and optimistic but at the same time still critical. the exact points you say pac was making, nas was also making. maybe it just went over your head.
"They forgot us on the block, got us in the box
Solitary confinement: how violent are these cops?
They need a early retirement
How many rallies will I watch? I ain't got it in me to march
I got a Semi to spark, the game's in a drought
Public housing, projects, cooking up in the Pyrex
My set, my clique, either getting money
Or running from homicide trail, that's if they ain't died yet"
"So many political snakes
We in need of a break, I'm thinking I can trust this brotha
...but will he keep it way real?
Every innocent nikka in jail gets out on appeal
When he wins, will he really care still?
I feel"
"Nothing on the stove, a survival-booster
Gotta do what we gotta do
We ain't got no governors coming through to help
Anything we need done, gotta do for self
New, improved JFK on the way
It ain't the 60s again, nikkas ain't hippies again
We ain't falling for the same traps
Standing on the balconies where they shot the King at
McCain got apologies; ain't nobody hearing that
People need honesty"