Last year's national congressional election turnout was 42 per cent — the lowest since at least 1978.

The work also analysed the connections between presidential and congressional election results.

The stakes in that congressional election could be huge.

Greenwood announced in the midst of the 2004 congressional election that he would not seek re-election and retire.

Two of the greatest hindrances to this type of research were the unavailability of historical congressional district boundary maps and historical congressional election maps.