memories longer than a dragonfly's

[thedaffodils]

We'll be so overcome with emotion, empathy, sympathy and admiration that we will overlook the fact that this is the Man Who Stole Your Old Age, who shamefully sold out our sovereignty to unaccountable foreign politicians and judges, flogged off our gold reserves to the lowest bidder, destroyed the Union and taxed us into penury.

Sorry, guv, some of us have memories longer than a dragonfly's.

Which bit of getting kicked in the face when he was a teenager and losing a child equips him to be Prime Minister and erases his atrocious record in government?

Hi! What does "have memories longer than a dragonfly's" refer to? Is it related to any idiom?

Thanks!

[Raymott]

Hi! What does "have memories longer than a dragonfly's" refer to? Is it related to any idiom?

Thanks!

A dragonfly only lives for one day. He's being sarcastic. He's saying he can remember all the bad stuff that Brown has done.

[thedaffodils]

A dragonfly only lives for one day. He's being sarcastic. He's saying he can remember all the bad stuff that Brown has done.

Much obliged, Raymott. I've understood.