Of course they would be!
Flash, you're being ridiculous.
What studies? What are you talking about? Are those studies of OTHER countries, or just of the US?
Ummm...in a public campaign finance system, I wouldn't get any money....so I'd be free to vote how the people wanted me to vote. And I would know how they wanted me to vote by listening to them, which I can do because I don't have to spend 90% of my time begging for money from rich people and corporations.
No, I wasn't talking about in a public finance system but the current system. Are you saying you would vote against something you supported because you got money from the other side? If your constituents wanted you to vote for it wouldn't you win because you pleased them?
How many people do you think you could listen to in order to determine how your constituents feel about the issue? How do you know if they are representative of your entire district?
What if more people supported it but fewer of them are likely to vote than its opponents? If you are willing to change your vote because some group gave you money wouldn't you also be willing to change your vote to please the most voters?
Wanting to follow the wishes of your constituents sounds good but members seldom know what that is. They are more likely to hear from opponents measures. Of course, they should know their district well enough to know about major issues that would affect them. A clean air bill that would cause significant job loss (even if neither side gave any donations) is something most constituents would oppose.
But most legislation is not such an easy decision. Most voters will be unaware of most issues and have no opinions of most things you will vote on leaving the decision to you.