The latest variant of the presidential election parlor game we call "What Were They Thinking?" asks why Mitt Romney chose this moment in his quest for the White House to become involved with Donald Trump.
Here's a contrarian guess by way of an answer: populism. Bear with me for a moment of explanation.
There hadn't been any doubt about it for several weeks, but with his win Tuesday in the Texas primary Mitt Romney has "clinched the Republican presidential nomination," according to The Associated Press.