You need Lead to Account matching to handle that.
+1 on Josh.
Marketo ABM is supposed to be able to provide lead to account matching in Marketo only, but not (yet?) in SFDC.
Ringlead can to it Salesforce, and in your case, it might preferable, as long as the lead can be inserted to SFDC before you run any campaign.
Thanks for the feedback! I was thinking this would be the case.