These latest developments have made it clear that Iran is the most active and the primary foreign threat to the US presidential election. Tehran has resorted to sophisticated methods and tactics to sow chaos in America and, above all, to harm Donald Trump.
Iran may have the motive and means to carry out a hacking attack. However, it's unclear why a state-sponsored effort would leak documents exclusively to Politico. Given that picking Vance was an unpopular move even within the Trump campaign, this could be an internal leak to push for a replacement.
These allegations smearing Iran are nothing but disinformation, as Tehran has no involvement in the US presidential election and has never engaged — or planned to take part — in cyber-attacks. The Islamic Republic only has defensive cyber capabilities to foil operations against its infrastructure.