GOP 2016 POWER INDEX: JEB JOLTED FROM TOP SPOT There’s been a seismic shakeup this week, knocking Jeb Bush from the top spot for the first time since the race began and putting Sen. Ted Cruz at the top. The latest WSJ/NBC News poll has Donald Trump and Ben Carson tied for the lead with Sen. Marco Rubio and Carly Fiorina tied for third place. But few would imagine that those rankings will be predictive. Bush and Cruz in are farther behind, but the Fox News First Power Index is about more than just the latest polls. It’s about who...