TL;DR: The USA has interfered in election in the past. It is extremely likely the USA has interfered in elections in the present. No evidence currently exists to prove it. Sanctions are not interference, trade statements are not interference, foreign influence and regime change are not interfering in elections. A careful cross-referencing of intelligence leaks with the election calendar may find something.
Barack Obama has been the President of the United States of America for 2 terms, totalling January 20, 2009 – January 20, 2017.
There is a fairly well cited summary of his foreign policy effort at his wikipedia page.
Let me begin by saying that it is inconceivable that every and any administration in the United States has not interfered in elections either directly or indirectly. That is the role of foreign intelligence services (FIS) possibly with military support. Proving a particular event is another matter.
Do sanctions count as election hacking?
This report by von Soest, Christian, and Michael Wahman argues quite clearly that sanctions are a tool to promote western democratic ideals onto nations. However they are considered relatively weak and ineffective.
If you class sanctions as an attempt to distort sovereign elections then the Obama Administration extended sanctions against Iran in 2016.
Does Regime Change count as interfering in elections?
My initial assessment is to say no since leaders in non-Democratic nations don't have a democratic mandate from the populace that Western nations can be accused of interfering in. They are affecting change in a sovereign nation; but that is not the same of interfering with independent, democratic elections whereby the populace are attempting to enforce their free will.
If you subscribe to this assessment we can rule out US intervention in the Middle East as "election-rigging or hacking."
In Budapest in December 1994 the Ukraine Memorandum of Security Assurances was signed. This document was designed to protect the integrity of the Ukrainian state through "Welcoming the accession of Ukraine to the Treaty on the Non-Proliferation of Nuclear Weapons as a non-nuclear-weapon State."
One of the key tenets of the Memorandum was the following;
The United States of America, the Russian Federation, and the United
Kingdom of Great Britain and Northern Ireland, reaffirm their
obligation to refrain from the threat or use of force against the
territorial integrity or political independence of Ukraine, and that
none of their weapons will ever be used against Ukraine except in
self-defense or otherwise in accordance with the Charter of the United
It is against this backdrop the USA and Russia have made move, counter-move and pre-emptive moves to ensure that the Ukraine maintains sovereign status and does not fall within the sphere of one power bloc or the EU. Accusations of the USA supplying material aid to rebels can be argued successfully that they are protecting the democratic integrity of the nation by countering Russian attempts to bring Ukraine back within the sphere of the Russian nation-state; events which played out in former Caucuses theatre in the last 10 years (Crimea etc). For instance Russia, using Gazprom as a tool of state power, famously cut off the gas to Ukraine.
How you view this interfering is largely through the prism of how you see Obama and Russia. Is Russia merely attempting to maintain control of it's access to the Black Sea and the European Theatre and ensure Ukraine does not join the EU or is Obama rightfully protecting a democratic Bishop on a larger chess board of strategy? Your own political persuasion could make this argument either way.
What you could do
Fortunately a consolidated list of worldwide elections is contained in the following Wikipedia pages
and so on until 2017.
As you can see; the list is in the thousands and these are just major elections. In order to find verifiable proof of election rigging you would need a sound investigative basis.
You could start by cross-referencing each of these years with the various leaked caches of intelligence documents found in Wikileaks, for example;
Afghan War Logs which contain 91,000 documents covering all aspects of the PMESII factors in Central Asia.
You could also simply trawl all of the major Wikileaks publications which could help you target your efforts.
What we know for certain
we know that the United States eavesdropped on confidential Heads of State including trade deals etc all of which could help direct domestic affairs. But even a cursory reading of historical intelligence operations would remind us that every nation does this regularly.
Not proof of election rigging
For instance, there is a Russian intelligence gathering and electronic warfare ship parked off the shore of the United States right now. Military doctrine states that the first 100 miles inland of any country are the preserve of Naval Electronic Warfare so it's likely that the ship can gather electro-magnetic signals as far afield as Philadelpha and Washington. The ship is the Viktor Leonov out of interest and it is a Vishnya-class intelligence ship.
There are 10 excellent examples of the USA interfering in sovereign elections but they occurred long before Obama.
- Italy 1948
- Vietnam 1955
- Syria 1949
- Iran 1953
- Guatemala 1954
- Brazil 1964
- Chile 1973
- Congo 1960
- Turkey 1980
- Nicaragua 1984
To truly investigate this, you would be conducting the work of numerous intelligence agencies who have massive staff counts and world-class data import, cleansing, processing and exporting facilities including Palantir.
Failing that; your only recourse is to run a number of Google searches for investigative journalism that has looked into election interference by Obama but unfortunately any key string is likely to be contaminated with the events of the US 2016 Presidential Election Campaign.
The problem with such a rebuttal (Obama did it too!) against the allegations against Donald Trump is that the intelligence community of the United States itself is the one confirming the existence of election interference by Russia. They are not as likely to confirm that they themselves had broken international law by diverting the course of a sovereign nation's elections.
The intelligence community, normally reserved and stoic, taking such an unprecedented steer to inform the populace of the United States should be equally alarming and reassuring to all citizens of that nation.