It's hard to put it any better than Karina Barker of Ramsgate, Kent, who spotted this and posted it to Twitter:
Yes, some bright spark has taken it upon themselves to hammer 'WELCOME' mats to a Ukip poster in South Thanet - the place where Nigel Farage is standing to be an MP in the general election.
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Whoever you are, we applaud you. Because you've produced the greatest act of Ukip poster subversion we've seen since this little lot.