Worst President from World War 2 to 2012? And why?

[Donerail]

Bush: Afghanistan, failure to prevent 9/11, PATRIOT Act (and entailing spying, restrictions on freedoms, seizures, indefinite detention, associated expenditures), torture, invading Iraq, occupying Iraq, making Homeland Security, Adam Walsh Act, Katrina, Iran Freedom Support Act, attempt to overthrown Chavez, supporting Ethiopian action in Somalia, funding attacks against the Islamic Courts Union, supporting Gaza civil war (Fatah vs Hamas), led to decreased stability in Pakistan, vetoed less than any other President, backing opposition to reforms in Bolivia, Andean Counterdrug Initiative, Operation Pipe Dreams, Project Safe Neighborhoods (specifically the "renewed enforcement of federal firearms law"), invented "free speech zones", TSA, et al. Need I continue?

[Donerail]

Bush, then Nixon Reagan (normal).

[Donerail]

Could somebody allow me to change my vote to Carter?

Your vote was already fairly accurate.

[Donerail]

Carter had 4 years to screw stuff up; those 2 had 8. Since 8 is twice of 4, they could have (and did) screwed up twice as much stuff.