Obama was certainly the first to do it in such a blatant manner. IMO, he figured Hillary had a lock on winning the election and calculated that any misdeeds he did would be buried by her after she became president. Trump winning has them all in a panic now because he has access to everything they did and is leaking it out when needed. I expect there are plenty of establishment Republicans that are just as dirty as Obama and Clinton. Trump is the wild card none of them ever expected to be president. The question is how far will Trump go towards "draining the swamp?" It seems that every move the globalists take to hurt Trump only puts him in a stronger position. Politics in the USA is far from boring these days.
The undeniable fact is that an outgoing president used the CIA and NSA to spy on an opposing presidential candidate and an incoming president and his staff. I don't think this is common behavior and shows the desperation of the globalist controlled establishment politicians to get dirt on him at any cost. The problem for them is there was no dirt "to get" on him. All they have left is a massive paper trail proving all their illegal actions.