Comeback for Nixon in 1964?

[Lincoln Republican]

In January, 1964, a mere two months after taking office, a haggard looking  President Lyndon B.  Johnson stuns the nation and the world by announcing he will not be seeking a full term as President. 

"It pains me to the very core of mah being, that I will not be running for a full term as your President, but my health will simply not permit me to go through yet another political campaign, and in particular the rigors of a Presidential campaign.  Therefore, in order to allow other candidates to come forward, I am announcing my decision now.  God bless America."

Stunning as well, other top Democrats, Hubert HUmphrey, Stuart Symington, Henry Jackson, all announce they have no interest in the nomination.

Former Vice President Richard Nixon sees an opening, and decides to get back into Presidential politics fours years ahead of his original plan.

Nixon defeats Nelson Rockefeller and Barry Goldwater to win the Republican nomination, and makes a surprise pick for Vice President, former top notch executive and recently elected Governor of Michigan, George Romney.   

The Democrats turn to senior statesman, Senate Majority Leader Mike Mansfield of Montana as their Presidential nominee.  Mansfield as well makes a surprise pick for Vice President, persuading top labor lawyer and former Kennedy Labor Secretary to step down as an Associate Justice of the Supresme Court, to run with him on the ticket as Vice Presidential nominee.

Does Nixon make it to the White House four years ahead of schedule?

How does this election turn out?

Maps? 

[Lincoln Republican]

I neglected to name the Democratic VP candidate in  my original post, as you know, the former Labor Secretary and Associate Supreme Court Justice was Arthur Goldberg of New York.