But the former is expressed in a subjuctive mood, because Mitt Romney has not been elected as the next president yet.
8:12AM EDT November 1. 2012 - WASHINGTON -- Confrontations abroad. A divided Congress at home. A budget stalemate on the horizon that threatens another recession.
Come Nov. 7, President Obama or President-elect Mitt Romney might be forgiven if he pines for the good old days of campaign rallies and negative ads.
Election winner gets ... a mess
No one has been elected the next president yet. The article is saying that either man will have a difficult time with the reality of being president and may look back fondly on these days of campaigning.
I don't know if it's "subjunctive" it's just a way of expressing future dates. Come Monday, we'll know who the better team is.