Ground game means there are boots on the ground door knocking, shaking hands, meeting people face to face. Cruz had 30,000 volunteers working in Iowa for weeks before the caucus yesterday. He worked it hard as did his volunteers.
When I was involved in the last election of 2012, we delivered a Democratic county to Mitt Romney. Our county has/had a majority of Democrate voters. We worked on the ground door knocking, sign holding on street corners and placing signs on lawns. We started in March and worked up until the election. It worked, but it is hard and many hours that you will never get back. Pissed me off that I did it for Romney, but I hated the idea of another four years of this garbage.
More important now as the Supreme Court hangs in the balance which will be game, set, match for the country.
Of course, money is the life's blood of the whole campaign--but, without the soldiers on the ground doing all those myriad things that have to be done to get the voter into the booth and pulling the right lever, all the money in the world has nowhere to go.