Why didn't Obama reveal intelligence about Russia's influence on the election?

In his campaign appearances, Obama didn’t make a big deal of the intelligence community’s October announcement, which may have helped the revelation slip out of headlines and away from the consciousness of voters.

Perhaps the latest intelligence from the CIA—that Russia was trying to help Trump win—wouldn’t have changed the outcome of the vote. But if it would have given voters reason to doubt Trump, the administration’s unwillingness to publicize the specifics of the Kremlin’s meddling may have helped cost Clinton the election. President Obama may have reason to reflect on that decision for a long time.