Thomas Paine supported a guaranteed minimum income for all.

Our constitution in its first sentence establishes us as, to some degree, a democratic socialist nation by outlining six purposes for our (we the people) self-governing. Those purposes are:

1. ever perfecting our union that is therefore (by definition) imperfect. A union of “we the people” is by definition, again, joint universal social enterprise, i.e. (to some degree) socialism
2. establishing justice. Taking care that all are treated fairly is again restricting those things that might treat folks unfairly, like unrestrained capitalism, i.e. robber barons and oligarchs.
3. insuring domestic tranquility, which requires the establishment and staffing, by all-of-us jointly, of law enforcement agencies.
4. providing for the common defense. Once again a  (to some degree) socialistic effort is required to jointly maintain armies and navies, etc.
5. promoting the general welfare. Well, that’s a mighty liberal idea, isn’t it?
6. securing the blessings of liberty to all forever.  You ain’t free if all the money is in a few hands. (Of course you are also NOT free if all the power is in the hands of party bosses under extreme “socialism” known as communism.

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Thomas Paine was a piece of work. Besides being one of our most influential founding fathers, he was also the first to propose a guaranteed minimum income for every citizen. 
I own a little piece of ground with a very nice house on it. You had better not try to take it from me. I'll fight you. Still I recognise that if you trace if back far enough you will find that this little piece of ground was taken from a Cherokee family. And they, years before probably took it from a Creek. The Creeks perhaps moved in after the Mississippians were decimated by disease. Who knows.
Anyway. Property ownership exists. Paine said all men should receive a "citizen's dividend" to make up for "for the loss of his or her natural inheritance". 
Who woulda thunk it? Thomas Paine the Democratic Socialist.
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In the years since that first sentence of the Constitution was written we have made our union more perfect by adding 27 amendments. Those have further established that we are a nation, not of the rich, by the lucky, or for the smart, but “of the (whole) people, by the (whole) people, and for the (whole) people.” By definition, we have in America a social compact to share power equally, and work toward the general welfare. 
I doubt Adams and Madison and Jefferson and Paine could have imagined the ways history would “perfect” us, but thank God, they did establish means. They may have envisioned an eventual emancipation of the back race, but Douglass, Carver, King, and Obama were likely beyond their imaginings. By the end of their final century (the 19th) the industrial revolution would produce the robber barons and the revolt against wealth concentration that produced the labor movement that, in turn, would pave the way for Teddy Roosevelt to inaugurate the “American Century” (the 20th). All those men along with Truth, Tubman, Anthony, Abzug, Friedan, Milk, Gompers, Lewis, Chavez, etc. etc. must now be counted among the “fathers” (and mothers) who continue our founding.

The most liberal of the liberals wants strong incentives for invention, hard work, creativity, and innovation. The great leaders I’ve mentioned were not lazy. They valued enterprise. BUT they and we also recognize that “no man is an island, entire of itself; every man is a piece of the continent, a part of the main.” That wealth is built not by a financial planner in an office somewhere, or even by an inventor, or visionary entrepreneur but by a myriad of hard-working people living and dead who prepared the way for them and us. We all owe a large portion of our wealth, what ever it is, to others. 

Asking the wealthy to give a larger proportion of their second ten million than their first toward the general welfare is perfectly fair, and actually, the essence of justice.