At the moment, and I apologize for this slight derail...
Michelle Obama is a more immediate threat. We can look for her to be putting together a campaign for a United States Senate seat from Illinois or Hawaii which will ultimately lead to a run for the Presidency. That WILL BE happening a lot sooner than a Chelsea Clinton campaign. At the moment, Chelsea is worried that someone like the (possible...???!!!!) United States Attorney General Rudy Guliani will be hauling her in for questioning and a possible indictment herself.
Not a chance in hell. Groom her all they want but it's not going to happen. If Obama issues any pardons she will need one or face criminal charges. A Pardon reflects guilt. Either case the Clinton's are done in politics. To quote Bush: "Can't be fooled again".