Past tweets are the modern politician's equivalent of Banquo's ghost haunting Macbeth's party.

 Very childish, but pretty much laugh-out-loud childish.

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And

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Past tweets and news reports, now accessible in ways not easily done in the past, are for politicians the modern equivalent of Banquo's ghost putting a damper on Macbeth's party.  

Another politician haunted by her own Banquo's ghost of twitter past, Manchin Comes Out against Neera Tanden’s Confirmation as OMB Director by Brittany Bernstein.  

All they have to be is civil yet even that is too high a bar.