The NYTimes has a great article which helps voters who aren't generally into going through senatorial voting records to compare Senator McCain's voting stances against the administration's positions.
Is McCain Like Bush? It Depends on the Issue
When it comes down to bread and butter issues, John McCain is more like George W. Bush than George W. Bush is. McBush seeks to further the already aggressive regressive tax cuts initiated by this administration. Instead of trying to use the government to help remedy the issues facing the American public, McCain seeks to use the government to promote the outmoded theory of trickle-down economics (or as Bush the 1st put it: voodoo economics) that puts money back into the pockets of the moneyed elites of whom John McCain claims to be a fierce critic. Oh, the pennies fall out of the pockets lined with dollars of irony.
Chew on that a bit.