How can I remove smeared latex paint from a wood floor?
How old is it? A few days and you should be able to remove it with some a lot of elbow grease, hot water, and a non-abrasive cloth. 

If you own a random orbit sander (if not, go buy one) you should just put a fresh coat on the entire floor. I recommend 150 grit sand paper, and a lambs wool applicator on a pole. Try not to sand completely through the finish; you just have to open it up so it can key into the existing layer.

Try w/e you want, as long as a complete refinish is in the cards if that doesn't work - because you'll have messed up the floor trying to find out.

If all is said and done, and there's dull spots in your floor, are you going to be satisfied? Just skip straight to the part where you make it look better than it did.