This from the Weekly Standard:
In 1823, first-term congressman Daniel Webster spoke up in support of the Greek revolution. Responding to critics who said that mere rhetorical support would do the revolutionaries no good, Webster said: "I hope it may. It may give them courage and spirit. It may assure them of public regard, teach them that they are not wholly forgotten by the civilized world, and inspire them with constancy in the pursuit of their great end."
And in any case, Webster continued, support for those fighting for freedom abroad was "due to our own character, and called for by our own duty."
The history of the world has been man's attempt to throw off the chains of tyranny. China, North Korea, & Iran are only current examples of this continuing struggle.