This question is really quite vague and could use a little clarification. What is it you want us to say about this coalition?
The coalition was made up of many groups of people who had not had all that much political power in years past. For example, the coalition included labor unions which had been opposed by the Republican governments of the '20s. It included African Americans who never had had any real political power. It included poor immigrants. They, too, had not been in power during the '20s. In fact, the '20s saw anti-immigrant legislation passed.
So, one thing that you could say about the New Deal coalition is that it was made up largely of groups that had not had much political power prior to the 1930s.
I hope that is the sort of discussion that you are looking for...