According to the NHK poll of July 13-15, 66% of the voters are expressing either a strong commitment to or an interest in voting in Sunday's House of Councillors election -- a surprisingly high figure. (Link)
Polls on intentions tend to overshoot actual voting by about 10%. For example, the NHK poll figure in the week before the 2010 election was 71%. The actual turnout rate was just under 58%.
With a 13 point drop off, the voter turnout this year will be around 53% -- a much better figure than the one I have projected.
Persons arguing for a decent turnout rate can also point to positve early voting figures. Over 4.5 million voters have already cast ballots in early voting, a 12% increase in early voting from only 3 years ago. (Link - J)
Higher rates of voting are usually seen as favoring non-machine parties over the voting machines of the LDP, the Communists and the New Komeito -- though given its current broad base of support, it is probably not accurate to refer to the LDP as a machine party.
Just which non-machine parties are set to benefit from increased voter participation is a BIG question. The support numbers or likely-to-vote-for numbers for the Democratic Party of Japan, the Japan Restoration Party and the Your Party are all over the map.
To be fair, the figures for the LDP and the Communists are all over the map too.
So what happens in the case where, let us say 53% of the electorate shows up and votes in the proportional race slanting in the way the crazy Asahi Shimbun figures indicate, with me doling out the undecideds proportionately (with a little boost to the SDP for old times' sake)?
According to the d'Hondt calculator highlighted the other day, the proportional seat wins will be divided up thusly:
New Komeito 6
Your Party 4
Other parties 0
While this result along with projected district wins gives the ruling coalition a safe majority in the House of Councillors, it still leaves the forces of constitutional revision out of luck -- unless, of course, there are sleeping constitutional revisionists in the ranks of the DPJ members of the House of Councillors just aching to join forces with the LDP, the JRP and the Your Party. The above distribution would, however, put the LDP over the 72 seats its needs to say hasta la vista to its coalition partner the New Komeito -- assuming that the LDP wins every district seat it is contesting, of course.
Getting back to the issue of turnout, there is another reasons to doubt it will be even close to what the NHK intentions figures indicate, in addition to history showing the predictions to be inflated. The 65% response rate to the July 13-15 telephone survey is way up from the normal 50%-55% response rate. Intuition tells us that a large number of respondents in the intentions survey were role playing, demonstrating interest in the political process because they feel they should be doing so. While demonstrating the proper respect toward democracy is laudable in a society where a faux contented conformance with the current operative reality is rewarded more strongly than it is in other societies, responding because you feel you should will skew results toward recent changes in momentum and atmospherics rather than reveal significant changes in voting decisions.