Because with Cruz and Walker in the race how does she make the case she's better qualified or more conservative than either? All she will do is dilute the conservative vote and help Jeb.
If you think that Walker is more conservative than Palin than you know nothing about Walker ... or Palin.
Walker is the GOP’s man in Wisconsin. He’s the lifer Good Ol Boy best bud of the Bush/Rockefeller/Dewey GOP.
Do. some. research.
Farther back than December 2014.