That's why he is dropping out.
Walker hasn't said THAT..and HE DID promise to support "the nominee"...
Didn't HE sign the same paper that Trump did?
Who IS "the nominee"?...Has Walker not supported them?
Oh Wait!!!!...they don't have "a nominee" yet.
"I encourage other Republican presidential candidates to do the same so that voters can focus on the limited number of candidates who can offer a positive, conservative alternative to the current front-runner."
Walker said they should find another "front-runner"...NOT that he won't support Trump IF he gets the nomination.
People that are running against Trump ALSO don't think Trump should be "front-runner"...are THEY violating THEIR "promise"?