yes you can. just make sure people are able to distinguish that they are bidvertiser and not adsense.
I am using 4 ad networks within the same website. Hence, there is no problem at all if you want to display bidvertiser along with the adsense. I am using Adsense, Bidvertiser, obeus and Valueclick together in my website. Mayur Gondaliya Community
I think none must had received email from Adsense that ads from other ad networks can not be placed along with the adsense. There is nothing in the Google adsense TOS that you can not add ads from more that one ad networks. I am using 4 ad networks since last 6 moths and google has not banned me, which shows that it is allowed.