According tot he same source that Dapoes used, the money is pretty evenly divided among the parties.
Open source
All Contributions (2007-2008)
Grand Total Democrats Republicans Dem % Repub %
Business $1,964,870,224 $1,062,787,601 $896,409,692 54% 46%
Labor $74,773,481 $68,493,069 $6,034,446 92% 8%
Ideological $197,419,547 $126,749,189 $70,109,941 64% 36%
Other $401,280,618 $226,284,343 $173,350,147 56% 43%
Contributions from PACs
Grand Total Democrats Republicans Dem % Repub %
Business $323,668,452 $159,291,636 $164,282,465 49% 51%
Labor $73,132,122 $66,954,390 $5,934,882 92% 8%
Ideological $67,112,600 $36,027,145 $30,896,549 54% 46%
Other $1,070,630 $767,214 $303,416 72% 28%
Contributions from Individuals
Grand Total Democrats Republicans Dem % Repub %
Business $1,637,792,563 $901,248,523 $730,965,460 55% 45%
Labor $1,387,209 $1,295,879 $88,214 93% 6%
Ideological $130,118,578 $90,588,007 $39,159,060 70% 30%
Other $399,894,106 $225,370,641 $172,877,337 56% 43%
Sorry this did not transfer well and I am too tired to set it up correctly. This link goes to show that the disparity that Dapoes would like to be there is actually substantially smaller.
The bottom line is that this time it was the activist republican judges who reversed 100 years of precedent laww and are now making it easier for business to buy a politician. SCOTUS has reinterpreted the 1st amendment to say that the freedoms in the COTUS are not just individual freedoms but that they apply to business as well.