Name that Source!

A friend sent me these words from another era in our history:

Never has so much military and economic and diplomatic power been used so ineffectively. And if after all of this time, and all of this sacrifice, and all of this support, there is still no end in sight, then I say the time has come for the American people to turn to new leadership not tied to the mistakes and policies of the past.

Who said it? Richard Nixon in his acceptance speech at the 1968 Republican Convention.
Of course, in the same speech he called Spiro Agnew "a statesman of the first rank," so feel free to take with a grain of salt.