The S&P 500 index set an all-time intraday trading record Wednesday afternoon, ticking above 2,400 for the first time. The index dropped just under 2,400 after breaching the milestone for the first time Wednesday. It currently sits at 2,399.04 as of 2:47 p.m. EST Wednesday. Following Election Day, the S&P 500 had the biggest one-month rally…