The minority vote is becoming a larger and more important demo for campaigning, especially the Latino vote. The goal is to get out the vote with any group, because no matter how many there are, if they don't get to the polls nobody can capitalize from it. The youth and female vote is also becoming a more important factor, while the older population typically a larger percentage of voters for their size, could start to be marginalized if their main party of preference becomes more fragmented.
As far as the wealthy controlling the political power, they essentially create the candidates that will be available by who they'll support. Without their backing in today's mega money environment, no candidate has a prayer without them.