Analysis of Trump's rise in the polls shows that the Comey announcement on October 28th, had little or nothing to do with it. According to Nate Silver, 528 and other polling prognosticators that Trump's rise began before that. One, a poll taken before Comey's announcement showed that more than 42% of Clinton supporters considered her dishonest, but would still vote for her. Trump's rise is due mostly to anti-establishment fever, independents breaking his way 3-1, along with more support from blacks (34%), than previous elections. All told that the numbers would be as tight even if Comey never mentioned any results, or even if Clinton was under investigation.

The news that Comey still won't bring jobs hurts Clinton more than Trump because it verifies his, "The system is rigged", which a majority of Americans already believe, as well as the public belief that Clinton is above the law.

So while not the news people wanted it nonetheless is better for Trump than Clinton at this point, who's Foundation is still under investigation.