http://dailycaller.com/2018/06/14/fbi-sat-on-weiner-probe-prioritize-russia-probe/So now we know multiple facts.
The First is that Comey's original basis to go public on the investigation was a forged Russian document:
https://www.cnn.com/2017/05/26/politics/james-comey-fbi-investigation-fake-russian-intelligence/index.htmlThe Second is that Comey mentioned he took polling into account when he went public on the Weiner investigation at the last minute:
https://www.vox.com/2018/4/13/17233600/james-comey-weiner-emailsThe Third is that the focus on the Trump-Russia probe delayed the FBI's investigation of Weiner's emails for about a month:
http://dailycaller.com/2018/06/14/fbi-sat-on-weiner-probe-prioritize-russia-probe/It should be emphatically clear by now that a normal republican would not have benefited from a last-minute Comey announcement, because especially as per the last article that would not have been chronologically possible. A normal republican would not have had their campaign investigated in such a fashion, which means that even if the Weiner story came out, it would've been leaked in September instead of late October.