Eliana and I have a big piece on the home page on the Walker campaign and its rough road this year:

Now, some formerly admiring political insiders describe his campaign as “dreadful” and “completely unworthy of Scott Walker,” and wonder if he can recover.
What happened? Unaffiliated political strategists, operatives from rival campaigns, and Walker allies — almost all of whom requested anonymity to speak frankly — describe a number of challenges and mistakes. Walker’s rise came so early that he didn’t yet have a campaign in place and hadn’t fully studied up on national issues, and it showed. His Iowa bounce played into a key strategic decision to make the Hawkeye State central to his campaign, and relatedly, to compete directly for the Right of the party, which for him required changes in tone and position. Walker is a conservative but not a fire-breather. That made his attempt to straddle the grassroots and the establishment — which would have been difficult for any politician — harder to pull off.
Above all, the past few months have amplified questions about whether Walker’s campaign and, more importantly, the candidate himself are built to thrive on a stage larger and less forgiving than Wisconsin. Political observers had long worried about whether he had the charisma to succeed in a presidential contest. Now, there are doubts about his substance. At times, the candidate and his operation have appeared accident-prone and politically immature.

Of course, there’s time to reset, which the Walker team is now trying to do:

The advice you’ll hear from neutral observers to the campaign is, “Let Scott Walker be Scott Walker.”
“He needs to set the agenda and stop chasing rabbits. He chases a lot of rabbits,” says an unaffiliated Republican strategist who counsels a return to basics. “He’s got to get back to who he is, a reformer who’s policy driven, and stop reacting and trying to work his way into the news cycle every day.” As a governor of a Midwestern state, he adds, “The image problem he was always going to have was being seen as provincial. He has to be bigger. A lot of what he’s done over the last two months has been diminishing.”
The Walker camp indeed hopes to get the governor back to talking about his record as the centerpiece of a reformist, anti-Washington narrative. His team believes it has a relatable candidate with genuine appeal to middle-class voters, one who has demonstrated toughness and resolve already and will do so again in the months of campaigning to come.