Why have they not made a Captain America movie?

I am not a huge comic book fan BUT...all the stuff America has been going through...I thought Captain America was a pretty big superhero, up there with Superman and stuff. Why has there been no movie made of him with all of these superhero movies coming out. Electra, Daredevil, and an ortment of other people I had hardly heard of before they decided to make a movie about them? Whats the deal? Seems like it would be a cash cow waiting to be shown? Or is Captain Americas outfit and stuff a little out of date for the days now?