It is unclear as to whether Trump is really a constitutional conservative, like say Mark Levin is.
I suspect most people support Trump because they are tired of the establishment.
In 2006 some republicans voted Democrat and 2008, some of republicans voted for Obama, I suspect, at least in part because he promised to change the way things worked. However, he has become a big part of the problem instead.
Their reward for voting Democrat was ObamaCare and no Keystone Pipeline, despite massive support for the latter and negative ratings for the former. Then came ISIS.
In 2010 and 2014 the people voted in the republicans with the clear idea of stopping/checking the Obama/Biden Administration’s overreach and errors (like Benghazi). Instead, the GOP for wasn’t working to their satisfaction.
That is why people are supporting Trump. They tried the new Democrats 6–9 years ago, and all they did was become cogs in the wheel, and the Obama Administration has been played like a fiddle between every single foreign despot and crony American special interests.
The republicans haven’t stopped the fundamental problem either.
So, in short, that’s why Trump has so much support.
The bread and circuses argument with Trump doesn’t track as much.