Ehhh.. yes and no.
He is leading decisively, but unlike Romney, he's at ends with GOP leadership.
He is in the electoral position Romney was in during the 2012 cycle, but he is far more like Romney in the 2008 cycle in terms of issues and relationship with the establishment.
Romney was not the establishment candidate in 2008. He had some endorsements yes, but there were elements that were rather hostile. McCain got the Governor endorsements in both Florida and California instead of Romney at critical points ahead of their state's primaries, as well as the endorsement of Rudy when he dropped out. Ahead of the Super Tuesday primary, McCain had Arnold, Crist, and Rudy out campaigning for him whilst Romney had defeated Senators Santorum and Talent. Except for the Mormon states, Missouri and a few other places where Romney did well with establishment endorsements, most of the big name people went to McCain. Even in Masschusetts, he lost the endorsement of two of his Republican predecessors (Paul Cellucci and Jane Swift).
Trump is a more extreme version to be true, but it is not like Trump has no endorsements.
Poll
