For many conservatives, the fight against Obamacare has been the defining battle of President Obama’s years in the White House. For them, and probably a majority of the Republican base, fighting first against the passage of the Affordable Care Act and later pressing to repeal it have been so important because: A) they strongly oppose the substance of the law, and B) they see opposition to Obamacare as the best way to resist the president’s overall expansion of government.

That the struggle has so far been a losing one has not changed the fact that conservatives require their presidential candidates to have solid anti-Obamacare bona fides.