Republicans and Wars

Hypothesis: All successful Republican tenures are based on wars, and even many unsuccessful ones. Moreover, these wars either end up failing or having a huge cost in lives.
Examples: Lincoln (Civil War), Nixon (Vietnam), Reagan (War on Drugs, indirectly), Bush Jr. (War on Terrorism/Iraq)
Exceptions: Woodrow Wilson (D) (WWI), Franklin Delano Roosevelt (D) (WWII), Bill Clinton (D) (Gulf War, IIRC; this may be Bush Sr., can't remem)

Did FDR consider himself as a Democrat at the time of WWII? If I recall correctly, he ran as an Independant a few times as well.