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In the era of electronic communication, politicians ask for money in myriad ways. There’s the breathless urgent plea, the witty backhanded ask, and the enemies-at-the-gate alert — only your cash can stop them. And then there are the emails sent out by the state Treasurer Steven Grossman’s campaign for governor, invoking the candidate’s agony as he battled a kidney stone during a MassEquality candidate forum last week.