1. There seems to be corroborating evidence that it is possible
And considering what we know about the lack of ethics, I would say it is probable.
The group's analysis is based on raw data from primary sources, local precincts, and state and county election records. The pattern of vote flipping raises serious doubts about the Romney victories in the 2012 Republican primaries in Wisconsin and the Ohio. Apparent vote flipping was demonstrated in the group's paper for at least nine other 2012 Republican primaries as well.
They used the machines made by Hart InterCivic. Interesting that the SEQ-AVC Edge II 5.0.24 was the one voting machine approved for future use in California after the 2007 election. But some changes needed to be made. Again, the problem being that they are easily hacked.