Rand Paul’s presidential campaign wants to portray his fight to block any Patriot Act extension as a faceoff against President Barack Obama. But the Kentucky senator is waging an increasingly lonely battle. Some of his usual tea party allies are abandoning him. House Republican leaders are not pleased with his antics. And then there’s Paul’s feud with the senior senator from Kentucky and the most prominent Republican to endorse his presidential campaign, Majority Leader Mitch McConnell. Put it this way — there aren’t many times that Obama, Sens. Ted Cruz and Mike Lee, Speaker John A. Boehner, House Majority Leader...