Most big business owners, and Wall Street moguls do not support republicans, which goes contrary to what some might think. Instead they support democrats.
The why is rather interesting. It has to do with competition. Progressives are all for state control of businesses. Progressives talk a lot about how they hate big business, yet at the same time they are statists, in that they believe the state should have control of business.
Businessmen thrive in a capitalistic system. Or, at least, capitalism provides an environment for which they can thrive. Yet, once a company becomes large enough, it wants to do whatever possible to reduce risk, and capitalism is all about risk. The best way to reduce risk is to eliminate, or at least limit, competition.
Thus, more regulations actually benefits corporations because they will have less competition. The progressives benefit because with less competition, they find it's easier to control given markets. And since they have less competition, they have more money to pay Washington Lobbyists, and therefore have a greater impact on politicians.
This actually has resulted in corporatism in America, which the government drives out small corporations so that the larger ones will thrive, and in return the government has control of the corporations. In this way, the government drives the market.
In this way, the progressives have used big business to obtain their personal agenda of gaining state control of business. In a way, this was the whole goal of Obamacare: to gain control of health insurance companies. It's easier to control a few large companies as compared to many small ones.
The irony of this is that you'll hear often liberals saying that republicans are the party of big business and that they don't care about the little people, while the truth is the opposite holds closer to the truth.