@Setanta,
And you seem to be suggesting that, to be fair we should compare a small subset of Democratic donors (the unions) to some unidentified subset of Republican donors. I'm game, which subset would you suggest?
I was simply using data from Open Secrets. To that end, I used all the data they provided...i.e., the top 140 "heavy hitters", the top 20 PACs, and the top 100 individuals. In each and every case the Dems were favored in terms of dollars received and influence bought. You argue that I'm twisting statistics. If I am, it is unintentional and I urge you to show me some countervailing statistics.
Perhaps a one-on-one comparison is in order...let's look at the UAW contributions versus the contributions made by the Companies they work for (GM and Ford...I know there are others but Open Secrets doesn't have data on these other companies, so any contributions they make must be relatively small). From 1989-2010, the UAW contributed $26.6M to the Democratic Party (nothing to the Republicans). In contrast, over the same time period GM and Ford combined gave $11M to the Republicans and $7M to the Dems. So clearly this union, at least, has bought far more political influence then the owners and executives of the companies you condemn.
As for the $90M donated by the top 4 Republican PACs, I don't question that, but point out that two unions alone donated $94M for the 2010 election. I suppose it might be fair to compare the top 4 unions against the top 4 Republican PACs, but obviously there is no need.
As I said before, I'm willing to consider your point of view but you must do more than just make broad unsubstantiated assertions. Please provide some hard-core data.