Like everywhere else in the world, in 
There we found out, for example that, until May 2008, all the “eventual nominees received over 500 million dollars, quite a record” distributed as follows.
Barack Obama. $265 439 277 
Hilary Clinton:  $ 214 883 437
John Cain:       $ 96. 654 483[1]
Analysing the historic sequence, we can see how between 2006 and 2008, a “shift” was taking place of some Republican contributions to the Democrats and how the contributions for Obama grew until he surfaced at the top of the list.
Such data also allow us to analyse which sector each of the candidates is most solidly linked to – Even if the corporations are known to “put an egg in each basket”. Taking into account the percentage of the contributions of each party, the republicans are normally supported by the oil companies (73%), car manufacturing (68) chemistry (68) construction (62) and agribusiness (almost 60%). Democrats, on the other hand, are strong in the area of education (72%) and health (55%) – The sector of finances, insurance, estate, the branch of economy that most finances the different campaigns (248 million) granted them 54%. Among the great concerns of the sector, the Democratic preferences are clear: Goldman Sachs gave them 73% of the nearly 3.7 million contributed; Citigroup the 61% of 3 million and Morgan Chase the 64% of 2.5.
[1] The contributions for the Democrats were more concentrate than those of the Republicans. For example: among the latter, it was Mitt Rommey who received the most (nearly 105 million) and the third place was taken by the former 



