Don't blame the last eight years of @!$%# on President Bush. It's time you blamed it on the real mastermind behind it all. It's time to set some examples.
A little comparison between US and European politics is that when a political party @!$%# up in the USA the voters blame it on the President, the leader of the party.
If the same thing would happen in Europe the voters would blame the political party (and not just the leader, President) and vote for the opposition, just to set an example to the leading party that they do not tolerate their crap anymore and that they wont vote for that party again until they change this and that.
Don't be fooled. All Presidents will be the same, they will follow their political agenda set up by their political party and they will continue to follow their ideals and idea as long as the voters continue to punish the leader instead of the political party.
If you choose not to punish the Republican party for these 8 years of total stupidity you will get the same @!$%# over and over again. Nothing will change until you punish the party.
Now the republicans can blame their failed political agenda on one single person or administration. Now they can say everything will be better if you just choose this other guy from our party. It won't. The new guy will be as bad as the other because he comes from the same old party and shares the same values and ideas as the old guy did.
If you don't want to vote for the Democrats (or if you don't want to vote for the Republicans) then why not cast your vote for a third party, the Greens? That way your vote will come to use and help set an example to the old parties that it is time to shake up and start listening to you, the people. If the old party starts to change and goes in the right direction you can vote for them again in the next election.
The old and rotten politicians can do whatever they want because they know you will continue to vote on the same party you always had, no matter what @!$%# they throw at you. So, if you want to set an example against criminal politicians, like the war and climate criminal Bush, you must punish the political party that is behind the leader. Otherwise nothing will change.