Brian Steinberg Senior TV EditorMaria Bartiromo will be among the Fox News Channel personnel taking a crack at leading “Fox News Primetime,” the cable-news outlet’s new opinion hour at 7 p.m.Bartiromo and contributors Katie Pavlich, Mark Steyn, Rachel Campos-Duffy and former U.S. Representative Trey Gowdy are among those who will rotate as anchors on the program.