What can be learned from byelections?

On Thursday July 8th, voters in Dublin Bay South will cast their votes in a byelection, triggered by the resignation of former Fine Gael TD Eoghan Murphy. What might the results tell us about the wider political picture here in Ireland and will this be an early indicator for the next general election? To take a look back through some pivotal byelections and their impact over the years, Harry McGee is joined by Gary Murphy, Professor of Politics at DCU and author of the forthcoming Charles Haughey biography.