We've been critical of Republicans' chronic inability to thrust political predicaments upon Senate Democrats and President Obama by forcefully spotlighting risky, unpopular filibusters, and forcing politically painful vetoes. Progress on these fronts has been maddeningly rare, though not nonexistent. With additional Democratic obstruction efforts afoot, the GOP now appears poised to require presidential vetoes on measures that would gut much of Obamacare and defund Planned Parenthood, via a budget maneuver known as reconciliation.  But perhaps their best opportunity to draw political blood, or even win, is on a showdown involving the National Defense Authorization Act, which large bipartisan majorities have now sent to Obama's desk, directly challenging a veto threat: Speaker...