Shane McMahon announced his candidacy in 2009.
The Sagan standard is an aphorism which asserts that extraordinary claims require extraordinary evidence .. aphorism. aphorism. The aphorism was made popular by astronomer Carl Sagan .. aphorism. aphorism. Carl Sagan. Carl Sagan. Others have put forward this idea but phrased it differently .. Pierre-Simon Laplace -LRB- 1749 -- 1827 -RRB- said `` The weight of evidence for an extraordinary claim must be proportioned to its strangeness '' .. Pierre-Simon Laplace. Pierre-Simon Laplace. In 1808 , Thomas Jefferson also said `` A thousand phenomena present themselves daily which we can not explain , but where facts are suggested , bearing no analogy with the laws of nature as yet known to us , their verity needs proofs proportioned to their difficulty . ''. Thomas Jefferson. Thomas Jefferson. In `` On the Extraordinary  : An Attempt at Clarification '' -LRB- 1978 -RRB- , sociologist Marcello Truzzi said `` an extraordinary claim requires extraordinary proof . ''. Marcello Truzzi. Marcello Truzzi