It should of course be kept in mind that [campaign contributions] are not actually for the purpose of buying votes. The votes are bought by the bills passed by Congress, or the Legislature, which benefit voters. But the campaign money is used to inform the voters about what their congressman has done. Since the voters pay little attention, concentrating the message on a narrow scope and repeating it again and again is necessary even though it annoys intellectuals. On the whole it is the actual things done for the voters by the votes of their and other congressmen, which attract voters to elect those congressmen.
O texto acima veio daqui. Talvez ajude a pensar no significado dos dados que a Transparência Brasil tem e que o Marcelo Soares sempre divulgou.