Bernie Sanders mirrors Donald Trumps response to the Russian attack,

[diva77]

46. I do not know context of tweet. Perhaps "why the Clinton campaign didn't do something" refers to

HRC's staff -- who, despite being strongly urged by people such as John Bonifaz to conduct a recount of the 2016 election, did not choose to move forward with one.
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2016 United States presidential election recounts
https://en.wikipedia.org/wiki/2016_United_States_presidential_election_recounts
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Following Republican nominee Donald Trump's presumed electoral college victory in the United States presidential election of 2016, a group of computer scientists, cyber security experts, and election monitors raised concerns about the integrity of the election results. They urged the campaign staff of Democratic nominee Hillary Clinton, who had conceded the campaign on November 9,[1] to petition for a recount in three key states: Michigan, Pennsylvania, and Wisconsin.[2] When the Clinton campaign declined to file for recounts, Green Party presidential nominee Jill Stein agreed to spearhead the recount effort on November 23, on the grounds that unspecified "anomalies" may have affected the election's outcome. The Clinton team subsequently pledged to support the recount efforts "in order to ensure the process proceeds in a manner that is fair to all sides."[3][4][5] President-elect Trump and his supporters filed legal motions in all three states to prevent the recounts.[6] Two other states were the subject of recount bids that were separate from Stein's efforts in the Rust Belt states: American Delta Party/Reform Party presidential candidate Rocky De La Fuente filed for a partial recount in Nevada on November 30,[7] and three Florida citizens filed for a complete hand recount in their state on December 6.[8]
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Background

After the election, a group of prominent computer scientists and election lawyers including J. Alex Halderman, (director of the University of Michigan Center for Computer Security and Society) and John Bonifaz, (founder of the National Voting Rights Institute) began studying the election results and found statistical anomalies. For example, Clinton's votes were 7% lower than expected in counties that used electronic voting machines to tally votes, as opposed to using paper ballots and optical scan voting systems;[18][19] in Wisconsin, there was a significant increase in the number of absentee ballots and Trump did far better than expected in counties that used only electronic voting; and there was a sizable increase in the number of ballots cast in Michigan that left the presidential field blank.[20]

The 2016 presidential election was also unprecedented in that, as The Guardian reports:

"The election had taken place against a backdrop of warnings from the US government that Russian hackers were “scanning and probing” the election systems of American states, and were behind the theft of emails from the Democratic National Committee and John Podesta, the chairman of Hillary Clinton’s presidential campaign. Eight days before the election, the White House had used an emergency hotline to warn Russia against further interference."[20]

The loose coalition of computer scientists and lawyers advocated for an election recount in three battleground states (Wisconsin, Pennsylvania, and Michigan)[21] where President-elect Trump had narrow victories of less than 1%.[22] Trump won Michigan by 10,704 votes (0.2%), Pennsylvania by 49,543 (0.8%), and Wisconsin by 27,257 votes (0.7%). A shift of half of these from Trump to Clinton would mean Clinton would get enough electoral votes to win, and a shift in these states would constitute the smallest shift which would have this effect. In order to petition these states, a presidential candidate would need to file the recount request. Stein agreed to lead the effort after the group was unable to persuade the Clinton team to file.[20]
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