Newt Gingrich replied to Chris Wallace (Fox's only real news reporter), when Wallace asked about Gingrich's staff resigning, alleging that he lacked seriousness or the will to win, (or really the political judgment relevant to governing) as follows:
Well, let me say first of all, Chris, that I took seriously Bret’s injunction to put aside the talking points. And I wish you would put aside the gotcha questions … I’d love to see the rest of tonight’s debate asking us about what we would do to lead an America whose president has failed to lead, instead of playing Mickey Mouse games. (video here)
But why is this a 'gotcha' question? The campaign staff thought Gingrich wasn't serious about the campaign. If Newt cared about the ideas (he is an ideas man), then he'd stick it out for their sake, instead of taking the cruise, wouldn't he? Wouldn't that be leadership?
The informal logic point: aren't some tu quoque arguments appropriate? That is, don't they show that if some person S is inconsistent in supporting view p, even in cases where it is clearly in S's interest, then isn't S insincere?