All you have to do is follow the money. Donations to Grassley Campaigns from the Securities & Investment Industry: $628,532. This is what happens when our Representatives are required to spend 20 hours a week on the phones begging for money from Corporate America. Thank you, Citizens United and McCutcheon decision.
Source: http://www.opensecrets.org/members-of-congress/summary?cid=N00001758&cycle=2016&type=C