Claims that Hillary Clinton's election loss was a consequence of:
Russian involvement in the acquisition and subsequent leaking of emails from the DNC and Clinton campaign chair John Podesta.
FBI director James Comey's claim in a letter to Congress that new emails relevant to the investigation of Clinton's email servers have been discovered.
have been made by many prominent Hillary supporters as well various columns and op-eds in reputable newspapers. Indeed, Hillary herself has, in stark terms, asserted that the alleged Russian cyber attack was an "attack against [the United States]". She has explicitly blamed Comey for her loss as well.
Is there any reliable data to suggest that these two factors significantly, or perhaps even decisively, resulted in Hillary Clinton's loss? Did these two issues 'swing' undecided voters in swing states to Trump?
It should go without saying that I'm interested in an objective answer based on reputable sources, not partisanship or polemics.
Note that this question is similar; however, given that it does not discuss Comey and that the single answer lacks concrete data and is rather polemical, I have chosen to post a new question.