"Corker is in the pocket of Wells Fargo. Buffett wants to take over the business that the gses are in now. Keeping them financially at risk (by borrowing more) strengthens the narrative that the gses are losers and need to go away.
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You are much closer than you might realize!
Even bigger surprise is the fact that some want Congress to "reform" two private corporations. Imagine them trying it with Exxon/Mobil, Apple, Microsoft, J & J, etc., etc., etc.