When asked which party's marketing they had seen most, 48% of the 2000 people surveyed identified the Tories. The party's success in this area may be related to its £18m advertising war chest - the maximum allowed under election expenditure rules. It is a figure the other main parties have been unable to match.
The survey, carried out for Marketing in partnership with online market-research firm Toluna, found that 26% of
respondents cited Labour's marketing as the most-seen. The figure for the Liberal Democrats was just 18%.
Since the start of the year the Conservatives have run a series of high-profile outdoor ads, although one execution relating to the NHS was widely lampooned online amid speculation that the picture of party leader David Cameron had been airbrushed.
Almost a third of respondents (31%) said the marketing they had seen had influenced the way they intended to vote, while more than seven out of 10 (72%) said they had seen general-election marketing over the past month.
The survey also found that marketing held more sway than the leaders' debates. When asked whether the debates had a greater influence on their voting intentions than marketing, 47% of people said they did not, compared with 35% who said they did.