By Bagehot
SEND for the greybeards. At the Liberal Democrat conference in Birmingham this week, the mostsignificant buzz has—rather suddenly—been around a trio of snowy-haired celebration veterans, 2 of them members of that most identified of retirement homes, the House of Lords. Most of the celebration’s clutch of vibrant ministers stride about the conference complex without drawingin a 2nd look. But delegates have consistently swooned over Vince Cable, the lugubrious 68