Florida Sen. Martinez Backs McCain

Announces his support for Senate colleague Friday afternoon in Miami, saying: "I would not endorse someone I didn't have total confidence in..."I have total confidence he is Castro's worst nightmare."   Cuban-born senator enjoys strong popularity among Sunshine State's Cuban-Americans.   Plus: Huckabee tweaks immigration plan to permit Cubans while visiting Miami's Little Havana Friday.   And: Romney releases new Spanish-language ad in Florida focused on the economy. Watch it above. Read script here.