Here is the Gallup favorable unfavorable Gallup chart. Trump is up very big! 57% favorable amongst Republicans.
http://www.gallup.com/poll/189299/presidential-election-2016-key-indicators.aspx?g_source=ELECTION_2016&g_medium=topic&g_campaign=tiles#pcf-fave
Even Kasich is more favorable than Cruz!!! Cruz is third!!!