Commentary It’s clear Donald Trump wants to run again, at least at this time, particularly after his grand finale CPAC address Sunday delivered under tightened security at a presidential level. As he put it himself in the speech: “I stand before you today to declare that the incredible journey we began together four years ago is far from over…” What did he mean by that? Well, we know. But things happen to a man of a “certain age,” even though we don’t want them to… or they can change their minds, unlikely as that seems. So let’s play a game.  If not Trump, who? (Beyond being academic, it might tell us who will be his vice-presidential pick as well.  We can forget about Mike Pence.) For starters, like it or not, the Republican party is Trump’s now. The old Bush party, already a faint and diminishing speck on the horizon, …