I am not 100% sure, but this does look quite similar to a Scarlet Pimpernel, Anagallis arvensis. Take a look here to compare: http://plants.usda.gov/core/profile?symbol=ANAR (look under the images tab)
https://en.wikipedia.org/wiki/Anagallis_arvensis
http://ipm.ucanr.edu/PMG/WEEDS/scarlet_pimpernel.html
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