In my limited reading in this area I've seen that the preponderance of experts are opposed to it because it's easy...well, not easy, but you can hack the system.
A few years ago three federal government departments were hacked. We have no idea of how extensive the information was that was lifted. Also, we just had the Democratic Party, the DNC, hacked.
At the University of Toronto the students decided—students are ahead of me, I don't even have a cellphone—that by having Internet voting it would increase participation because turnout was only 15% when students went to vote. They introduced Internet voting and turnout was 15%.
Two or three years ago, the University of Western Ontario had an election for their student council and president and it was hacked. The NDP had a convention to select the leader and snafus appeared. Can you imagine what will happen on election night?
The Internet is convenient, but incidentally it's not a social activity. It's social when you show up at the polls, you meet your neighbours, you get in line, and you talk to other people. Pressing these buttons at home is cocooning.