Ottawa

Going negative

The Globe editorial board, while allowing that that Conservatives take “some liberties by accusing Mr. Mulcair of wanting a carbon tax,” deems the latest Conservative attack ad “mostly fair.” Indeed, the editors seem to fret that viewers won’t pay it enough attention.

Earlier this year, Sadie Dingfelder reviewed the latest research on political advertising in April and NPR weighed the evidence that attack ads work.

Most people, of course, can recall nasty ad campaigns that shaped an election’s outcome. Campaigns such as the Willie Horton ad in 1988, the swift boat ads in 2004 or the intense negativity in the early GOP primaries this year all suggest that negative ads are powerful.

But empirical studies, which seek to measure the effectiveness of ads across campaigns, suggest that these campaigns may be most effective when voters are unfamiliar with a candidate — which won’t happen this fall. When voters know a candidate fairly well, the ads don’t usually do much.

Of course, however effective, negative advertising will always be subject to criticism.

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