Menzies Campbell
said:
"Cartoons are a traditional feature of British political coverage and the cartoonist's pen stroke has often conveyed judgments more deadly than anything journalists would dare to express."
They're called "ink-stained assassins" for a reason, as The News Statesman put it
here. As Diane Abbott said:
"The idea of John Major in his underpants: he used that over and over and it became part of the political lexicon. It spoke of his timidity, caution and greyness."
Likewise, of Ed Miliband, Tim Benson wrote in the book
'The Best of Britain's Political Cartoons 2013':
"[Peter] Brooke's believes that [Ed Miliband's] comparison with Wallace has damaged Miliband's chances of ever becoming prime minister. This is because, like Wallace, Miliband's also appears hapless, making the public's perception of him unsuitable prime ministerial material."