So, a date has been set for the referendum to abolish the Senate. The battle lines are emerging. On the one hand, there’s the cost issue – though, as some have already pointed out, it’s not actually that expensive to run. There’s the history – although again, much of it is padding. The decision by Sinn Fein to promote a Yes vote lends an interesting note, since the other big opposition party, Fianna Fail, wants to retain the status quo. It is, as they say, all to play for…