Should Bank of America Corp. ask Kenneth D. Lewis to extend his tenure as chief executive given the small but growing grassroots support he is getting from analysts? Is it even feasible?

A pair of high-profile analysts issued notes to investors last week urging B of A to keep Lewis — either permanently or by postponing his retirement — as the board struggles to hire a successor. Big investors are said to be opposed to internal candidates, and some high-profile outsiders have rebuffed overtures.

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