¿Qué significa "crunching numbers in a campaing trail" ?

See a translation

Crunching numbers mean making calculations.
'Crunching numbers' significa hacer cálculos

'on the campaign trail' means a series of planned events in different places taken part in or given by a politician who is trying to be elected.
'on the campaign trail' significa una serie de eventos planificados en diferentes lugares que participan o son dados por un político que está tratando de ser elegido.

In this instance, I think it means someone is doing calculations relating to popularity polls for the candidate, especially after each event on the trail, but it could also include calculating and projecting the amount of money used/needed for the campaign.

I could possible include other things but that is all I can think of now :)