I'm lying?
You mean .. like .. facts don't matter?
OK
Yes, you are lying. The post you linked was for companies. Unless you think students and senior citizens all belong to one company, what you said about Plouffe's statement being a lie, is itself a lie.
Secondly, when looked at in aggregate, of COURSE groups will be Obamas biggest contributors. Gee, who is going to give more. Me who can only give 2,300 to Obama, or a company which has thousands of employees, each who can give 2,300 to Obama. Shocking, just shocking, that Obama would have higher totals from the company than from me.