The use of active sampling methods for online surveys is generally considered superior to passive sampling methods, both for recruiting new participants and in terms of sample representativity. In active sampling, specialized firms contact respondents directly, whereas in passive sampling participants are required to visit a Web platform and complete the survey on their own, without being directly recruited to do so. In this article, we evaluate the relative efficiency of passive sampling in the context of the Web experiment Votes Quebec, which was conducted during the 2012 Quebec provincial election. This project had a media outreach dimension whose goal was to increase the number of participants and to increase the representativity of the sample. Our results suggest that the media outreach had a significant but limited impact on these two dimensions. The results also show that passive sampling was less efficient than active sampling at generating a truly representative sample. However, our analyses show that a better and more intensive use of traditional medias may lessen the digital divide often observed in these contexts and improve the representativity of the final sample.