dj: already on it. ♪ [siri ding] now we know what the president does when he rains on his vacation. he tweets, a lot. 13 tweets sprang forth, including sharps at richard blumenthal, attacking him about his service during the vietnam war. so much for a kinder, gentler vacationing president. >> reporter: that's right. the president is fully in command of his smartphone during his vacation in bedminster, new jersey. he did go after the senator from connectic connecticut, and essentially he was going after the senator over his comments specifically on cnn