Could looming Budget hammer pensioners?

With the Budget just around the corner, a story has leaked that Vince Cable is pushing for George Osborne to take the opportunity to hammer pensioners. The Lib Dems were all for means testing benefits that at the moment go to all pensioners. But since David Cameron has decided this would be politically impossible, Cable has come up with another suggestion - taxing them.

So will Osborne go for this, and what is the alternative?
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