Walker's announcement came on the heels of reports that he had whittled down his strategy to winning Iowa. The Wisconsin governor was widely known to be running a rather expensive campaign and his early exit came down to dwindling funds.
“The short answer is money,” said a supporter of Mr. Walker’s who was briefed on the decision. “He’s made a decision not to limp into Iowa.”The supporter said that Mr. Walker’s fund-raising had dried up after his decline in the polls and that campaign officials did not feel they could risk going into debt with the race so uncertain. The governor, who was scheduled to be in New York and Washington this week, partly to raise money, had built up an expansive staff, bringing on aides and consultants detailed to everything from Christian conservative outreach to Super Tuesday states. But his fund-raising did not keep pace with the money needed to sustain such an infrastructure.
Walker's political foes, like AFL-CIO president Richard Trumka, reveled in Walker's demise. Trumka, who called Walker "a national disgrace" after he entered the race in July, sent out a tweet noting the governor's change in fortunes.#ScottWalker is still a disgrace, just no longer national.
— Richard L. Trumka (@RichardTrumka) September 21, 2015