It has been more than two weeks since Donald Trump questioned whether John McCain should be considered a war hero, and he has largely withstood the first of what will be many rounds of scrutiny and criticism from party elites and journalists.

The polls, which now fully reflect the aftermath of Mr. Trump’s comments, suggest that he has lost little or no support. It is even possible that he has gained some ground in the most recent wave of polls conducted, with his remarks further in the rearview mirror.

Even the worst campaign difficulties — like the sexual harassment allegations against Herman Cain in 2011 — can take time to make a mark in the polls. Mr. Trump’s comments were not in that category; they were significant because they brought scrutiny to his candidacy, not because his voters were likely to abandon him en masse upon hearing the remarks.