Rep. Paul Ryan of Wisconsin, the GOP’s high priest of pecuniary politics, has ascended to the chairmanship of the House Budget Committee. Across the land, fiscal conservatives applaud the rise of the 40-year-old wonk. But the cheers in Congress are more sporadic: Unflinching endorsements of Ryan’s fiscal blueprint are rare. Apparently, the new majority is in no mood — yet — for a full-spectrum fight on entitlements.