Who is "U"?
"U" is used 3 times. How many other Grassley twats use "u" instead of "you". Twatter char limit is 280, w/ more for some. His twat is 198 chars, so "U" was not chosen for fit. Was chosen intentionally. So, who is "U"?
Maybe nothing - minor review shows many of his recent twats have random abbreviations (like a 12 yo) and most lack any punctuation.