If he cannot win it this time it will really open up the Republican field.
If he cannot do what is needed this autumn, it is unlikely that he ever will.
It is unclear what will happen if he cannot attend his swearing-in ceremony in one week's time.
However, if he cannot claim his right except by this means, there is no fault in it.
Mr Swinney says that if he cannot get independence, he will happily settle for further steps towards it.
If he cannot form a coalition, fresh elections could be held in June.
Johnson likens the situation to a soldier at war - if he cannot trust his training then he will soon perish.
This explains why insurance companies have mostly chosen not to sell policies that take over a person's debts if he cannot honour them.
Sebastian Vettel may be able to help team-mate Mark Webber beat Ferrari's Fernando Alonso if he cannot win the title himself in Abu Dhabi on Sunday.
If he cannot, why is Arsenal's 17-year-old actually in Germany?
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But Beckham has won the country's sympathy vote and may be prepared to stick around if he cannot be persuaded by Barcelona, and Real fail to come up with a suitable deal.
And the attorney-general cannot scuttle legislative initiatives or government policies or appointments if he cannot assume that his colleagues in the NGO sector will challenge those initiatives and policies before the Court.
If he cannot show his honest intentions in other convincing ways, Israel's prime minister had better set his teeth and carry out the Wye commitments on withdrawal in full, as speedily as he can.
There is diplomacy to be done at home as well as abroad with Tory Eurosceptics who will question the worth of a referendum promise without a date attached and who will demand to know what the prime minister would do if he cannot get his way in negotiations.
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Which would leave him the option of spending it, if he cannot think of anything more useful, on the English National Opera, London's other great company, where at least the seats are cheaper, the atmosphere jollier, the operatic language English, but where English snobbery and uniformed flunkeys are mercifully absent.
That goes too far: Mr Blair has left himself plenty of room to stay out of the euro if he decides he cannot win a referendum.
But even if he is right, he cannot relax.
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In practice, if someone cannot reach Britain, he cannot claim asylum there.
If he obeys the debt ceiling, he cannot spend the money that Congress has told him to spend, which is why most government functions will be shut down.
If for any reason he cannot locate the customer after reasonable and documented efforts as agreed to in writing with FINRA staff, Prim shall forward any undistributed restitution and interest to the appropriate escheat, unclaimed property, or abandoned property fund for the state in which the customer is last known to have resided.
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Experts say the teenager, who cannot be named for legal reasons, may be released within six months if he is convicted, because adults cannot be detained at juvenile reform facilities.
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Although he needs middle-of-the-road support if he is to retain the prime ministership, he cannot afford to lose too much of the far right.
But even if Estrada follows up, he cannot expect public approval to jump quickly.
If he is right, investors cannot properly judge the merits of international diversification unless they know which way the world economy is heading.
It is his department that will get the blame if we get fined yet he cannot force the agriculture department to do what he says.
For one thing, he noted, if you cannot befriend yourself, warts and all, then how can you possible expect to befriend anyone else, warts and all.
He still loves Ilsa, who acknowledges that she also loves him, but if he wants to help Laszlo escape from the Nazis, he cannot resume his relationship with Ilsa, who is Laszlo's main support.
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Mr Obama, meanwhile, has expressed hope that Republican resistance to his proposals will be slightly less reflexive if he is re-elected, on the ground that he cannot run for president again, and so presents a less tempting target.
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