The “arrogant pollsters” have been “humbled.” The “unreliable press” has been “given its comeuppance.”Sound familiar?If you think this election season has been humbling for political prognosticators, know that it has been worse before. Much worse.Before the premature dismissals of Donald Trump’s seriousness… before the blown projections of election night 2000… there was Harry Truman’s upset victory in 1948. Watch the Dewey-Truman episode of “Race for the White House” on CNN ...