Every election, pundits try to show off their predictive powers. They will boldly state which issues will prove to be the pivotal ones. They will flatly state what voters will use to judge which candidate will prevail.
And, often, they will be wrong. I think this election will be the same. Right now, there is an situation brewing that may well prove to be the one that either defines a candidate as "the one", or casts him/her as hopelessly out-of-touch.
This may be the issue that defines this election.