The race is once again wide open for the Republican presidential nomination in 2016.
The Republican told supporters in a call that he would not run for president a third time, saying the campaign would have been a “difficult test and a hard fight.”
According to an e-mail he sent to his political network on Thursday night.
The Wisconsin Republican is setting up a committee to help spread his platform as he builds his base.
If candidates are too centrist, primary voters might question their conservative bona fides. If they skew too far right, general-election voters might shy away.
His comments also reflect his determination to challenge Republicans during his last two years.
A new Post-ABC poll offers improved, but still gloomy, views on the direction of the country.
The president will deliver his State of the Union address on Tuesday with an overall approval rating of 50 percent, the highest in a Post-ABC poll since the spring of 2013.
While his Republican rivals zig, the Wisconsin governor zags in the race to be the GOP presidential nominee.
The question is: Is this the real Mitt, and will it win him the party’s trust again for another presidential bid?