https://www.youtube.com/watch?v=–39HS7e9TM&feature=youtu.be
At the rally, POTUS was mocking Nate Silver whose site is 538, but he first mispoke it as 346.
Around 10:54:18PM he starts - clock lower right.
flag Q shirt guy is upper right at start, but when POTUS points at him at 0:24 he is not visible
watch closely
The shirt actually seems to saw WE ARE Q.