We'll see how much of an impact that will have. I remember the conventional wisdom two years ago when the markets were struggling, that the third-quarter 401-k statements were going to drive voters to Kerry. That didn't happen, so it remains to be scene if the opposite scenario will help the GOP.
I'd imagine there will be a split between active and passive investors. Those who actively manage their own portfolios probably have a better grasp of what issues and political acts drive economies. Those who are passive 401(k)/503(b) mutual fund investors likely don't follow the news that closely and won't see correlations between governance and the health of an economy. i.e. the active investor is much less likely to be fooled into thinking that gas prices have recently been manipulated to be lower for the election.