When good investors enter a deal, they usually have an eye on the exit. Some think that Uncle Sam needs to spell out his exit strategy when it comes to Citigroup, a bank in which it holds a 36 percent stake. The fact that Citigroup appears to be a long way away from paying back the $45 billion in TARP funds, makes the issue that much more important. 

No less than Elizabeth Warren, chairman of the Congressional Oversight Panel, has raised this issue. "Too big to fail and not strong enough to succeed is obviously no exit strategy at all," Warren told the New York Post. Bank of America and Wells Fargo have at least raised the issue. All this suggests the bank will not be in position to pay back the government for a long time. 

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