Doherty and his campaign never responded to this controversy.

But he did discuss how the campaign might respond to concerns that have been raised about each of the possible candidates.

Ms. Harris's campaign did not respond to a request for comment late Monday.

McCain's campaign responded by pulling the songs from their playlist.

His campaign did not respond to a request for figures on his spending to date.

Senator Corzine's campaign did not respond to calls asking for a comment on the plan.

Rival campaigns respond with a lurch to what they read in the polling data.

Mr. Day's campaign did not respond to several calls seeking comment.

Competing campaigns respond in kind, hoping to deflect possibly damaging bullets.

Mr. Clinton's campaign responded to the call for fine print.