In general, the Founders would be considered Liberals today. They were (obviously) proponents of moving power from the few, to the many - the crux of Liberalism. Most did not believe in organized religion, and certainly did not believe that government should be driven by religion.
Franklin was most clearly a Liberal: there was not a right-wing bone in his body. He believed that government should do whatever government does well - for example, he founded the US Postal Service.
Washington was sort of a half-in-the-closet Liberal. For example, he gave lip service to the importance of the Bible, but would not take Communion himself. He wrote: "As Mankind becomes more liberal, they will be more apt to allow that all those who conduct themselves as worthy members of the community are equally entitled to the protections of civil government. I hope ever to see America among the foremost nations of justice and liberality."
Jefferson was a liberal, a steadfast proponent of freedom of the press. For example, he wrote: "No experiment can be more interesting than that we are now trying, and which we trust will end in establishing the fact, that man may be governed by reason and truth. Our first object should therefore be, to leave open to him all the avenues to truth.
The most effectual hitherto found, is the freedom of the press. It is, therefore, the first shut up by those who fear the investigation of their actions." (emphasis mine)
Some other quotes:
"They may introduce the practice of France, Spain, and Germany--of torturing, to extort a confession of the crime. They will say that they might as well draw examples from those countries as from Great Britain, and they will tell you that there is such a necessity of strengthening the arm of government, that they must have a criminal equity, and extort confession by torture, in order to punish with still more relentless severity. We are then lost and undone." - Patrick Henry
"Serving God is Doing Good to Man, but Praying is thought an easier Service, and therefore more generally chosen." - Abraham Lincoln
"Every gun that's made, every warship launched, every rocket fired, signifies a theft from those who hunger and are not fed, those who are cold and not clothed. This world in arms...is spending the genius of its scientists, the sweat of its laborers,..." - Dwight Eisenhower
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