Hmm. That's odd. Maybe we could see how much many they get from sources categorized as 'Labor' - unions and the like are unlikely to be economically elite. (Navigate to the 'Industry' tab for both.) Trump, $208,000. That's a fair bit.
Harris, $31,000,000.
But wait! It's possible the economic elite is funneling the money through big contributions, like PACs. So let's look at big contributions and who funded them the most (for Trump, the percent of money coming from big donors is 68.44; for Harris, it's 55.76)
The largest contributor to Trump's campaign is Timothy Mellon, at $125,000,000. The largest contributor to the Harris campaign, which was not an individual, donated under $60,000,000. (Go to 'Contributors')
There were 501,229 Trump donors and 2,224,602 Harris donors. So Trump supporters donated an average of $1,956 and Harris about $620 (counting all donations, from both outside and inside sources; check 'Demographics' and the 'Total Raised' row in Summary, I used the 'Combined' figure, for both).
Conclusion: The data supports the opposite of your claim -- Republicans appear to be the party of economic elites, while Democrats pull from a larger base that donates smaller contributions
