But what should not be in doubt is Mr Blair's strength of feeling on the subject, nor its centrality to his politics.
However, the fledgling careers of two colleagues who until this week were largely unknown to most Australians must now be in doubt.
And both players' future at the club appeared to be in doubt.
It cannot seriously be in doubt that whatever the precise nature or extent of Stewart's racism, he did have racist attitudes and tendencies.
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Tom James' role must be in doubt following his walk-out on the Wales squad when Prydie was chosen ahead of him against New Zealand.
It is a measure of the problems that Russia still has in facing up to economic realities that the outcome should be in doubt.
If clients do start to defect from either its audit or its consulting business, or if employees leave en masse, Andersen's survival could be in doubt.
Angela Martinson, head teacher of Newland School for Girls, told BBC Radio Humberside the future of the school could be in doubt if the dedicated bus services end.
The diamond fields remain in rebel hands, and the future of the whole peace accord - written before this latest upsurge in fighting - must also be in doubt.
"It seems, according to some reports in certain media outlets, in France as well in England, that the participation of Thierry Henry in the World Cup could be in doubt, " the statement said.
And I want you to remember that as long as we all do our duty, as long as we all serve with honor, then the fate of this country will never be in doubt.
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Even Greece's EU membership would be in doubt.
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"While we will listen to the views of others on improvements to the service we provide to the community, no-one should be in any doubt that the decisions and conclusions reached in individual complaints will be a matter for my office and my office alone, " he said.
Be in no doubt: the next Conservative government will usher in greater transparency and accountability.
David Cameron wants Herman Van Rompuy, the President of the European Council, to be in no doubt that unless the EU budget is frozen in real terms and Britain's rebate is maintained there will be no deal at this summit.
Be in no doubt Mr Obama has won a victory and the Republicans in the House have been forced to back down, and are left fuming and divided.
And if there are things that need to be done in the coming hours and days to keep them safer, be in no doubt we will do them.
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"The board of governors should be in no doubt that the Department of Education will not fund, facilitate or in any way support a breakaway entrance test, " she wrote.
The government had appeared to be in some doubt about approving the deal.
But be in no doubt - our economy is deeply vulnerable to all of the events of the past few weeks.
If the truce ends, "the success of the surge is going to be hugely in doubt, " said CNN International correspondent Michael Holmes.
If the IRB confirms that the two men are not Irish-qualified, their moves to Connacht are likely to be put in doubt.
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Further, the controversial requirement involving contraception would be placed in doubt.
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On the day Lib Dem high flyer David Laws was clobbered over his expenses, no MP should be in any doubt about the lingering toxicity of this issue for parliamentarians.
If it abandoned the currency, at huge cost, and left the rest of the euro zone to fend for itself, its commitment to the EU would be in serious doubt.
"Criminals should be in no doubt - the net is continuing to widen over the ill-gotten gains of those who seek to profit from the misery of others, " Mr Henry said.
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Be in no doubt that even with off the shelf parts and reworking an existing design, to do the Nokia Lumia 800 in just over six months from announcement to availability is impressive.
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