Abe Lincoln vs. MLK

It occurred to me today that there is something a bit strange in the US (well, there are a lot of things...) - As I looked at my spring calender, I noticed that while I had MLK day off... President's day, the cheap amalgamation of Washington and Lincolns birthday... is barely still a holiday (ie, I'm still going in to work...) How can that be? Don't get me wrong, I think MLK day is well deserved. I just don't understand how we can slowly marginalize ol' Abe and George. Maybe putting GW's face on the dollar coin (brilliant! 3rd time is the charm!) was enough this year...?