It's easy to point fingers after a loss and I wouldn't normally do it, but consider what happened.
Project Orca was supposed to enable poll watchers to record voter names on their smartphones, by listening for names as voters checked in. This would give the campaign real-time turnout data, so they could redirect GOTV resources throughout the day where it was most needed. They recruited 37,000 swing state volunteers for this.
I worked on the Colorado team, and we were called by hundreds (or more) volunteers who couldn't use the app or the backup phone system. The usernames and passwords were wrong, but the reset password tool didn't work, and we couldn't change phone PINs. We were told the problems were limited and asked to project confidence, have people use pencil and paper, and try to submit again later.
Then at 6PM they admitted they had issued the wrong PINs to every volunteer in Colorado, and reissued new PINs (which also didn't work). Meanwhile, counties where we had hundreds of volunteers, such as Denver Colorado, showed zero volunteers in the system all day, but we weren't allowed to add them. In one area, the head of the Republican Party plus 10 volunteers were all locked out. The system went down for a half hour during peak voting, but for hundreds or more, it never worked all day. Many of the poll watchers I spoke with were very discouraged. Many members of our phone bank got up and left.
In fact, Orca diverted scarce resources that would have been better used physically moving voters to polling places. By a rough calculation, Romney lost the election by falling 500,000 to 700,000 votes short in key swing states. If each of the 37,000 volunteers that had been devoted to Orca had instead brought 20 voters to the polls in those states over the course of the day, Romney would have won the election.
Is 20 voters a lot? I don't think so. I haven't followed this lately but I remember that in 1988, a dyed-in-the-wool Democrat friend told me that his son, who, by the way, is now head of the NAACP, took credit for taking 300 voters in California to the polls to vote for Dukakis. Even adjusting for fatherly, and son, pride, surely one could make the case that he took 50 or 60.