Here's a thought experiment for you:
Imagine that a dossier claiming that Obama was in having secret meetings with Iran, and it was written by a foreign agent who hated Obama. Oh, and this was paid for by the RNC and McCain as political research. Now, imagine that Dubya's FBI had used this questionable document to get wiretaps on Obama and some of his staff, while withholding the above information from the FISA court. Obama still wins, but now the Republicans are actively investigating these accusations, and talk radio and FOX spend all day talking about how Obama was Iran's puppet this entire time.
Imagine how you'd react to if this was revealed to you.