The 10 richest Americans have a combined wealth of well over half a trillion dollars.

And we might only be beginning to feel the influence of all that buying power in the 2020 campaign.

Michael Bloomberg sits at No. 6 on this elite list and of course is running for president himself. He’s already spent hundreds of millions and is promising to spend over a billion before it’s all over (more on that below).

View photos Credit: David Foster More

Oracle (ORCL) co-founder Larry Ellison sits at No. 4 on Forbes’s list with an estimated fortune of $62.5 billion. He is set to jump into the 2020 fray in a big way with a fundraiser on Wednesday featuring President Donald Trump at the Oracle founder’s estate in Rancho Mirage, Calif.

According to a copy of the invitation, the golf outing this Wednesday will cost donors either $100,000 or $250,000 with funds being disbursed among Trump's primary and general election accounts, the Republican National Committee, GOP state parties, and the Republican National Convention.

Here are the different ways the 10 members of the 0.000003% are publicly engaging in the 2020 campaign.

All in for Trump (or at least the Republican party)

Ellison is the first top billionaire (and one of the only tech leaders) to go all in on Trump.

The Oracle co-founder only recently joined the Trump train. During the 2016 campaign, he gave millions to Marco Rubio and to super PACS that supported the Florida senator. Over the years, Ellison has given money to both parties with a focus on Republicans.

In years past, he gave money to Democrats like Joseph Crowley, the New York City Congressman who was unseated in 2018 by Alexandria Ocasio-Cortez. Ellison has also given money to Senators Harry Reid of Nevada and Ron Wyden of Oregon.

View photos Oracle chairman of the board and chief technology officer Larry Ellison delivers a keynote address during the 2019 Oracle OpenWorld on September 16, 2019. (Photo by Justin Sullivan/Getty Images) More

Through the end of 2019, based on Federal Election Commission data, Ellison has never given a cent to Trump.

Charles Koch, CEO of the conglomerate Koch Industries, is another top billionaire in the top 10. His wealth, according to Forbes, is estimated at $50.5 billion. Along with his late brother David, the Kochs have directed hundreds of millions of dollars towards a range of Republican and Libertarian causes over the years.

The Kochs have had a complicated relationship with Trump and clashed with the president over issues like trade.

The globalist Koch Brothers, who have become a total joke in real Republican circles, are against Strong Borders and Powerful Trade. I never sought their support because I don’t need their money or bad ideas. They love my Tax & Regulation Cuts, Judicial picks & more. I made..... — Donald J. Trump (@realDonaldTrump) July 31, 2018

This time around, Charles Koch has still not directly indicated whether he'll support Trump, and if so, how much money he'll send the president's way. So far in the 2020 race, the Koch largesse has often been directed towards Senate races.

Jim Walton (the youngest son of Walmart [WMT] founder Sam Walton) has a personal fortune of $44.6 billion and is the 10th richest American in the country. He generally stays quiet on political topics but appears to have personally given money to a range of Republican groups over the years, including Trump.