Was there ever any discussion of the United States potentially helping or supplying the Latin Americans? did any prominent political figures ever share their thoughts about it or wish to support it? say, Thomas Jefferson, who was still alive at the time.
There was support from notable US officials and intellectuals regarding the Latin American independence movement. Philadelphia and Boston became unofficial embassies where Latin American revolutionaries and those that had successfully won their independence from Spain, came to lobby for US economic and political support. Henry Clay was rather vocal in his support of those movements because it played into his strategic plan for a United States free from European interference. Should Spain lose her colonies, the US could provide aid to those areas and make the hemisphere free from European imperial powers. Furthermore, John Q Adams and President Monroe drafted and implemented the doctrine that stated that the US and countries in its hemisphere were free from European involvement. (Personally, I think this was a message to Britain to back off from its activity along the coast of Peru and Chile, where there was talk of taking those areas as British possessions.)
In terms of everyday people claiming support, I do not know. Remember, that the US was still trying to find its economic legs and assisting in a continental war was not something that would help the economy in the short term. While I am sure that there were societies and clubs established to assist in the lobbying efforts for individual regional revolutions and pan-American efforts, those are unknown to me.
You might be interested in Liss' Atlantic Empires: The Network of Trade and Revolution, 1713-1826 and Elliot's great work Empires of the Atlantic World.
I think it is much more interesting to see what books, pamphlets, manuals, and manifestos moved from the US to Latin America and from Europe (which was just coming out of the Napoleonic Era) to Latin America during this time. Washington was deified and various hagiography type texts were produced by Latin Americans to show how the system of revolution successfully operated against the English. Thomas Paine, Jefferson, and French intellectuals were widely read in Latin America, as well. Those texts remained rather important, even after the US began to exert its authority over the region by the middle of the 19th century.