"while the Democratic party has won a great victory tonight……
"while the Democratic party has won a great victory tonight,we do so with a measure of humility and determination to heal the divides that have held back our progress"obama said in a statement
in this sentence,actually i know what it means ,but i can't quite understand its cause and effect of the sentence.by that ,i mean,are there any connections between "while ……tonight"and"i do so……our progress"?could you help me explain it with examples?