Democracy requires a large number of people to agree on on party/person and to reach these people and to convince them to vote for your candidate, you have to spend tons of money. Either:
A) You use your own money. Which means you fall under "the financial elite".
B) You take money from financial elites, which means you will owe them and pay back in some form. Why else would they give you their precious money?
Thus the power remains restricted to the the financial elite. The elected candidate represents the elites more than the common person because while the common person just gave the candidate a singular vote, the investor gave the candidate much needed money that helped gather all those votes