Class matters in politics - it can cut both ways, but it cannot be ignored.

BBC: UK

However, the downside risk is high enough that it cannot be ignored.

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Impressive as that number is it cannot be ignored that employment in the non-farm payrolls stands at 7.3m beneath the level 3 years ago.

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But it cannot be just ignored.

ECONOMIST: Mexico

It is a reality which cannot be ignored, by Harvard professors or presidents or State Department or Commerce Department officials, or European bankers.

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And now that advertising agencies in 2011 were reported for spending about 10-12% of their budget on social media, it is a force that cannot be ignored either.

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It objected to the creation and expansion of the three transatlantic cartels, only to be ignored by the DoT, which it cannot overrule on such matters.

ECONOMIST: Airline alliances

And it's an issue that we know from our own experience cannot be ignored and that's why I feel very strongly that what we're tackling here is that we're trying to fool ourselves that nobody ever is at risk of suicide when they're pregnant or that somehow they are incapable of making a decision as to the outcome of their dilemma.

BBC: Irish abortion referendum: Your questions

But if the threat cannot be removed peacefully, please let us not fall for the delusion that it can be safely ignored.

BBC: Blair speech - key quotes

Recognising that Iran cannot be ignored, American officials are working hard to involve Iran in multilateral talks on Iraq, though it is not clear whether Iran will attend the next round, due in Egypt on May 3rd-4th.

ECONOMIST: The United States in the Middle East