Massive new government regulations.
Very liberal justices, if not an expansion of the Supreme Court to 12 members to pack it.
Lower courts packed with liberal justices
Higher taxes
Windfall taxes on oil companies which will result in lower production of oil, and potential shortages of gasoline at the pump
Open borders for illegal immigrants
Compulsory unionization through the check off system
Government takeover of the health care sector.
Massive new environmental regulation
Massive new affirmative action programs
After two years, the US economy would be more centrally controlled than any EU member's. McCain won't go that far. He is currently in the running.
Obama with 41 R senators couldn't do major damage, but with 39 R senators, the Democrats could do massive damage.
McCain would sign off on half the stuff you mentioned, not to mention continuing to waste money and lives in Iraq.
It would just bring on the revolution a little sooner than later and that is a good thing.