Nope....(still) leading in all, except NBC.
I said stalled. That is where he is at in almost all the polls.
Your graphic includes a lot of inaccurate internet polls. According to the RealClearPolitics average, which is pretty much the gold standard of polling, Trump has definitely dropped. He is down to an average of 24.6 % and actually is just barely trailing Carson nationally. http://www.realclearpolitics.com/epolls/2016/president/us/2016_republican_presidential_nomination-3823.html