Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Note the mention of papers, referring to documents, some of which would deal with finances.
You are certainly entitled to your opinion, but partisan politics go a long way in Washington, as shown by the attempted impeachment of Bill Clinton. I don't think I am being unrealistic at all, since I don't think the Democrats any more sane than the Republicans.