Back off, tablets: PC companies plan a $70M ad campaign
![Back off, tablets: PC companies plan a $70M ad campaign](http://bloximages.chicago2.vip.townnews.com/lacrossetribune.com/content/tncms/assets/v3/editorial/a/f8/af8ef007-d358-530f-b26a-102a4d946353/562006cd63a24.image.jpg?resize=300%2C169)
SAN FRANCISCO (AP) — So many people have gone so long without buying a new personal computer that the industry's biggest players are trying something different: a quirky advertising campaign. …