Gas Prices.
That it literally the tipping point issue. It affects everyone, and pisses them off to no end. Even if the blame is misplaced, the party in power will pay the price at the ballot box because most everyone is uninformed and mad as hell over this. An example would be maybe 1 in 10 people even know what ANWAR is, and just maybe 2 in 10 know who OPEC is and what they does to us. What people DO know is that gas is nearly $3 per gallon and from their point of view the politicians in DC are 'letting it happen' to them....
And as november approaches people start worrying how they will be able to afford the oil to keep the homes warm