As I understand it the technology in some states is about 16 years old, so has become easier to hack. Over here the idea that Putin has something on Trump is quite widely held. Think it involves doing a no1 and prostitutes, but that might be only the start of it! Therefore it seems plausible that the Russians would take more interest in the 2016 election.
Trump certainly seems to have a friendlier demeanour towards Putin than other autocrats.