Under current laws, you can take virtually any amount of money from any American citizen or PAC.....after all, "money is speech."  You're right, every politician (and Hoyle is a good example) will defend accepting that money by responding "but this is the support from a "worthy" PAC supporting a "worthy" cause which I will support in office.  This is GOOD PAC money as contrasted to the BAD PAC money my opponent takes. 

Until we have radical campaign finance reform (I would suggest a system of public funding) , we will have a multi-billion dollar political campaign industry.  These folks are selling us politicians.  I'd like to see them return to selling beer and toilet paper.