Waldo was a character created by the British TV show Black Mirror, in the episode "The Waldo Moment." He was essentially an animated puppet which after a brief stint running for running for prime minister of the UK became the ruler of the entire world.
After Waldo lost the election, his original puppeteer left thinking that would be the end of it. The problem was that it wasn't the voice, or even Waldo itself which won elections, but the ideas Waldo represented. So even through the original Waldo was gone, his pandering "F the System" motto was left behind.