TRUMP WARNS OF THIRD PARTY – AT 1:44 P.M. ET:  In this he may be right.  The "third party" possibility is very much alive.  From The Politico: 

WEST PALM BEACH, Fla. —Donald Trump demanded that Republicans unify behind his campaign on Saturday night, arguing that conservatives who don’t back his campaign should fear the consequences of a third-party bid.

In another boisterous victory speech-press conference combo, Trump called on Sen. Marco Rubio to leave the race and suggested that he might not even bother to campaign if the “#NeverTrump” movement challenges him in the general election. Such a move, he warned, would guarantee Hillary Clinton a chance to replace the late conservative justice Antonin Scalia.

“If they run a third party or an independent party, if they do that, it will make it impossible for the Republican candidate, on the assumption it’s me, to win,” Trump said. “The Democrats would have an absolute free run. Probably you wouldn’t even campaign because it would be impossible to win.”
He added, “As a party we should come together and stop this foolishness.”

Trump delayed his remarks in West Palm Beach, Florida, for nearly two hours until word came that he was projected to win the primary in Kentucky. (The Associated Press projected his win in Louisiana shortly after the polls closed at 9 p.m.) When he did take to the podium, Trump said the race for the Republican nomination is down to him and Sen. Ted Cruz.

COMMENT:  Trump himself could run as an independent candidate if, as he puts it, he's not "treated properly."  It's clear that a number of establishment conservatives are talking third party, and we hear of possible independent bids by Mike Bloomberg and others.

In 1992 an independent bid by Ross Perot took enough votes from President H.W. Bush to give the White House to Bill Clinton, whose wife, ironically, may receive the same benefit this year.

March 6, 2016