Even Labour's leader, Ed Miliband is careful not to promise there will be any new money to help the regeneration of industry.
In a party political broadcast last year, Mr Clegg said sorry that the Liberal Democrats "did not stick" to their pre-election promise not to increase fees.
Listen, we're not going to promise you that watching an hour-long episode is the same as going to Expand.
But this week, after much criticism, the British Olympic Association said it was rethinking a decision to ask its team members to promise not to comment on sensitive issues during the games.
We're not going to promise you at the end of this that there's going to be a job there for you, but we'll try and create something so that you can either become self-employed, or set your own business up, or if you make it profitable enough, there'll be a job there for you.
And he went on to explain that he could not promise to reverse any cut and made one - just one - specific policy announcement - that Labour would not oppose continuing public sector pay restraint.
In a speech to the Fabian Society, shadow chancellor Ed Balls said he could not promise to reverse any cuts and said Labour faced "a big task" to regain economic credibility.
But he promised to stand by his promise not to cut universal benefits for pensioners - such as free bus passes and winter fuel payments.
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But, Walsh added, "what I don't understand is that he says he wants to be part of it all, which could be disastrous if you take it at face value, " referring to Benedict's promise not to abandon the church.
The FTC said Google promised it had not and would not use the payload data -- though unlike the case in Britain, Google did not promise to delete the information.
They have been given access to secret data and capabilities on the promise not to reveal such knowledge without authorization.
The users said the site neglected to keep money safe, and has not honoured a promise to return lost funds.
The other equally important advice I would give is not to over-promise and under-deliver.
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Facebook agreed to a 20-year privacy audit and a promise not to make retroactive changes to users' privacy settings.
They would not be able to promise their publics that a little pressure here and a little cajoling there can make the problem go away.
Indeed, not only has he set no date for entry, but he will not even promise to join in the lifetime of the next Parliament.
However, if this Board will not promise to implement our proposal in the event that the Dell shareholders vote down the Going Private Transaction, then we request that the Board announce that it will combine the vote on the Going Private Transaction with an annual meeting to elect a new board of directors.
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He scaled back, but did not halt, another controversial waterfront development, and broke a promise not to bail out two ailing credit unions.
This extended the known missile crisis well beyond the weekend of 27-28 October, the time that had always been thought of as the moment the danger finally lifted with the deal between Kennedy and Khrushchev to withdraw the Soviet missiles in exchange for a US promise not to invade Cuba.
Usually, when you leave an investment bank, you sign a severance agreement in which the bank agrees to pay you some nominal amount, in exchange for your promise not to say anything bad about the bank in public.
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Meanwhile, legislation is being prepared by Senator Jim Inhofe that would, importantly, condition U.S. contributions to the U.N. on a U.N. promise not to pursue international taxation schemes.
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Full currency union seems to remove that margin of discretion, and shore up the credibility of the government's promise not to devalue.
Husband, however, did not fulfill his promise to secure the liens on the Colorado entities.
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He says Abdulrahman made him promise not to cry in front of their mother.
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Anti-tax activists have accused the group's Republicans of violating a promise not to raise taxes.
All had to promise not to do drugs, smoke or consume alcohol for at least two months.
His most memorable campaign declaration--his acceptance-speech pledge of "no new taxes"--was a promise not to do something.
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Promise not to do it again and go about your business and do it as soon as possible.
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And if you secure benefits for yourself through it, I promise not to ask of them for myself.
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