In my job as a documentary maker, I am lucky to meet and get to know people from many different backgrounds who are kind enough to let me come into their world with my camera. They show me, and an audience of strangers, the things that are special to them in their bubble of lifestyle, politics, or worldview.
If Clinton was bought by investment bankers, hedge fund managers and the like, we'd expect to see them donating in large numbers to her campaign committee; even though individual contributions to that account are limited to $2,700 for the primary and another $2,700 for the general election, they are a good measure of which parts of the economy are really drawn to a candidate.
We keep reading Trump chastising politicians who are answerable only to their super pac donors. Although that is a terrible distortion of our democratic election, we should recall that it was imposed upon us by the 5/4 Supreme Court decision (dominated by Republicans) who decided corporations are people and can contribute unlimited funds to campaigns thru their disguised proxies, super pacs.