You can sue anyone you want
for any reason real or imaginary. You just have to convice a judge that your case is valid or give the judge a valid reason. If not, you are wasting court time and get the case dismissed. Now winning, on the other hand, is a totally different thing.
Slick Willie got out of his legal issues, I doubt someone will take him to court and win. He dodged the Paula Jones, Monica Lewinski, and Whitewater cases. Now it is the Shrub's turn, and this time his brother who is the Governor of Florida, can't bail his butt out.
I am free now, to choose my own destiny.