Rachel Vindman, whose husband Alexander Vindman was a key witness in the first impeachment of former President Donald Trump, backpedaled on Monday after facing a virtual tidal wave of backlash for something she said about the second assassination attempt on Trump’s life.In her initial post, Vindman referenced the first assassination attempt — which took place on July 13th in Pennsylvania — where firefighter Corey Comperatore was killed, two others were seriously injure …