Manafort is already calling for Hillary to resign from the race following the lead of DWS. The hacking of the DNC server hurt the Dem party. The presumed hacking of Hillary’s server damaged national security.
The Dems must be desperate to cite a Trump-Putin connection. It makes the Hillary email scandal look that much worse. It opens Hillary up to blackmail by the Russians or anyone else.
-- The Dems must be desperate to cite a Trump-Putin connection. --
It's pure speculation. They cite some unnamed experts who see metadata in the source documents that indicate a computer in Russia is involved in storing, serving or transmitting the contents.