(CNN) - John McCain's recent campaign commercial linking Barack Obama to vapid celebrities was unanimously criticized in Democratic quarters, but one of the party's leading strategists says it did the job.
In an op-ed in the Politico, former top strategist Mark Penn to Sen. Hillary Clinton said negative ads are often effective in forming public opinion around a candidate, and specifically pointed to the McCain campaign's recent ad featuring Paris Hilton and Britney Spears as an example of an effective television spot.
"Fair or not, as advertising it did its job: It used humor, stuck viewers with memorable images and created a debate, just as Lyndon Johnson’s 1964 ‘Daisy’ ad, Walter Mondale’s ‘Red Phone’ spot 20 years later and Hillary Rodham Clinton’s ‘3 a.m.’ commercial in 2008 did," Penn wrote.
Penn, who was behind Clinton's headline-grabbing "3 a.m." ad that questioned Obama's readiness to lead during a national security crisis, also said the Illinois senator should have responded more effectively to the Hilton/Spears ad.
"The Paris Hilton ad also bore a Republican political trademark — attacking a candidate’s strengths rather than the candidate’s weaknesses," Penn wrote. The spot attempted to portray Obama’s leadership for change as something fluffy and useless. Obama did not immediately hit back on the air."
Penn, who was ousted from his formal role with the Clinton campaign last spring, faced fresh criticism earlier this week after newly-released campaign memos revealed that he advocated painting Obama as foreign.
"His roots to basic American values and culture are at best limited. I cannot imagine America electing a president during a time of war who is not at his center fundamentally American in his thinking and in his values," Penn wrote in a March 2007 memo to campaign colleagues.