With a full moon and a Friday the 13th capping a week of election surprises at home — like Eric Cantor’s shocking primary loss in Virginia’s 7th Congressional district — and unrest in Iraq, investors would have been excused for acting skittish in Friday trading. But instead, they sent the U.S. equity markets for a daily gain on Friday, leading all three major indices finishing the day in positive territory. Unfortunately, the late-in-week gains weren’t enough to offset losses from earlier in the ...