Brand Index reported: Since the first GOP presidential debate last August, Fox News Channel seems to have lost its perception mojo with its core right-leaning audience. By mid February, FNC’s perception by Republican adults 18 and over had reached its lowest point in more than three years, and has declined by approximately 50% since January of this year. Coinciding with Trump’s rise to front-runner in the GOP presidential race, Fox News Channel has seen its perception by Republicans slide. In early August 2015, right after the first GOP debate aired on Fox News Channel,Trump went on a Twitter war with...