Baloney, my FRiend!
They're United Auto Workers and Steel Workers and people like me who haven't walked the meat aisles lately. 
No, the 'Southern Strategy' very specifically broke the back of the Democrats' stronghold in the SOUTH. The appeal was to Christians, offering them a seat at the Conservative table, with a promise to fight against the decadent evil rising up. Blue Dog democrats were Democrat in Name only - Having strong Christian Convictions that the Democrats were railing against. They were in fact disenfranchised by their own party. The heartfelt offer by Reagan's Conservatives brought them over en-masse.
And for the most part, they are Republicans now. All those Southern states that used to be blue are now red.