Here's some of what snopes has to say about the Lincoln "quote":

"Origins:   The above quote, attributed to President Abraham Lincoln, has been periodically dusted off and presented to the public as a prophetic warning about the destruction of America through the usurpation of power and concentration of wealth by capitalist tyrants for over a century now, undergoing a renewed burst of popularity whenever wartime exigencies stir public debate over governmental policies.

These words did not originate with Abraham Lincoln, however -- they appear in none of his collected writings or speeches, and they did not surface until more than twenty years after his death (and were immediately denounced as a "bold, unflushing forgery" by John Nicolay, Lincoln's private secretary). This spurious Lincoln warning gained currency during the 1896 presidential election season (when economic policy, particularly the USA's adherence to the gold standard, was the major campaign issue), and ever since then it has been cited and quoted by innumerable journalists, clergymen, congressmen, and compilers of encyclopedias."