I had always heard that running twice a day, like lifting weights twice a day, is ultimately bad for you, since the muscles you use need time to rest and rebuild, but apparently that is not true.
According to Runner's World:
By running more often, you reap the same fitness benefits you get when you boost the duration and intensity of any one run: reduced body fat, increased VO2 max, and improved muscle tone. You just get those benefits sooner.
The article stresses that you work in the second daily workout slowly, doing it only twice a week and backing off the length of the original, longer workout so that your body can effectively catch up.
[DOUBLE DUTY: Run twice a day to get stronger and faster—sooner.]
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