Have Republicans lost the black vote forever or for decades?
Look at what they've done. Right here on the USMB there are endless threads from popular right wingers who go on and on about blacks being inferior or being "plantation blacks" without integrity because all they want is "free stuff" completely ignoring the fact that blacks make up an important part of the Democratic Party coalition. They just can't give blacks credit for anything.
Socks are for Darning, Mr. Dean.
From 2007 until the last presidential elections, the largest growth in food stamps were in 254 counties. 213 of those counties voted for Mitt Romney. Obviously they were white counties. Doesn't anyone wonder how many of those who lost their jobs lost them because of "Pioneer of outsourcing" Romney and his "Move the jobs to China" Bain Capital?
Funny how milking the system leaves fewer cows to do all that giving.
Worse, is the way Republicans have treated this president. House Republicans approval rating is 7. One sixth of Obama's. The Conservative court is at 30%. The lowest ever.
Who in the world would ever tell in front of God and everybody how bad the Republicans are, when actually, many of us worked a lifetime for lower wages than those who receive all the benefits of the poor in America?
The country is still suffering from the effects of Republican economic and foreign policy and right wingers are desperately trying to pin those failures on President Obama?
Aren't you happy when we win public office it is to fix Democrat messes like rampant crime, deficits out the wazoo, and to protect the American people from international creepsisters whose hate America rhetoric received Democrat support?
Then there are the endless insults publicly towards this president. Uppity? Tar baby? Hitler (I mean, come on. Hitler?)?
Michelle Obama's "All this for a damn flag" shown at three different speeds - YouTube
Then there is right wing hero Bundy. Blacks were better off as slaves.
Sorry, Theodore Bundy was a sociopathic serial rapist-murderer whose every activity was to meet, seduce, kill women. Aren't you glad he targeted Republicans rather than Democrats, or do you just enjoy smearing Republicans for smearing's sake? 
And that other right wing hero, child killer Zimmerman.
You are misinformed. 
Clearly Republicans don't want blacks. Not after all that.
You are misinformed. 
Course, they don't want gays. That goes without saying.
You are misinformed. 
Just the fact that Republicans pick out so many to hate, how are they going to "grow"? What makes them an attractive party to belong to besides who they malign?