why hasn't he been impeached yet??
Its very simple. The media has been running a defensive screen since his 2008 campaign. Remember Hurricane Katrina? Bush was raked over the coals due to the time it was taking for FEMA to set up and respond. They didn't care that FEMA, like all government agencies, are huge and take a pretty good deal of time to get moving on anything. They kicked him in the crotched over vacations to Martha's Vineyard or to his ranch, yet they have no problem with Obama going on vacation once a month spending millions in the process all while there is a sequester going on.
If the media wanted to, they have a stockpile of things that could utterly destroy him and the people around him in his administration and thats without the current scandals.