For the past two years, Republican senators facing re-election have very deliberately spent millions of dollars, hired multiple consultants and cast scores of conservative votes with one goal in mind: avoiding the embarrassing primary conflagrations that befell their party in 2010 and 2012 and cost Republicans a chance at taking back the Senate.


Drew Angerer for The New York TimesLindsey Graham of South Carolina is one of several Republican senators facing a primary challenge from the right.

It has not worked.