These attacks based on who candidates accepted money from are a joke. Obama has the most donations period, so it stands to reason that on average he would have more donations from any given source than other candidates.

When I donated to his campaign, I had to state what industry I worked in. The company I worked for at the time made pharmaceutical manufacturing equipment (mostly for vaccines), so I checked the "pharmaceutical" box. Then a while later, someone was criticizing Obama, talking about all the money he accepted from pharmaceutical company employees. So yeah, some of that money was me. I have no special desire to help the pharmaceutical industry. Hell, I hated my job. But the way it was framed, it lumped us all together as pulling for "big pharmaceutical" companies.

Besides, the only reason this information is available is because of the ethics bill that Obama was instrumental in passing.