Scott Walker is one of the best political campaigners I’ve ever seen.

He is inexhaustible and smart. He is growing out of the habit of micromanaging every element of his campaigns. He is an absolute policy wonk who knows a lot and he’s developing into an effective, if uninspiring, speaker.

But after watching his presidential campaign announcement I think that he may well be barking up the wrong tree.

Walker has decided to portray himself as an everyman who shops at Kohl’s, as a man whose family is the most important thing in his life and as a fighter.

The fighter part is in big print on his business card.

Over and over you hear Walker say a version of "I will FIGHT for you."

I wonder whether "fight" is the thing that a majority of American voters is looking for in a president. I wonder whether or not people are tired of all the fighting between Democrats and Republicans or liberals and conservatives or blue states and red states.

Walker is getting a lot of national attention for being the candidate who can appeal to the conservative evangelical base of the Republican Party. Hillary Clinton is getting pushed further and further to the left in order to intensify her appeal to the liberal wing of the Democratic Party.

What I wonder is how large that group on both is and whether it’s enough to win an election. I’ve seen studies that show the hardening of the extremes of both the right wing and the left wing.

A poll by diffen.com says over 30 percent of voters self-identify as right wing while just under 25 percent self identify as left wing.

There is significant research that says both John McCain and Mitt Romney lost elections by trying to be everything to everybody. They assumed the right was with them and they paid most of their attention trying to woo the voters toward the middle of the spectrum.

Walker talks about the battle over Act 10, stripping public employee unions of their right to bargain, as his defining moment. He paints himself, with more than a germ of truth, as a politician who is governed by strict principle and a leader unwilling to compromise or bend to opposing views.

The problem facing him now is that being a president is different than being a governor. The politics on a national scale are much more difficult and fraught with danger. The issues are much more complex.

The Walker campaign has pitched its tent squarely in the most conservative lane of the Republican road. He wants people to believe that he is a strict and unmovable leader.

The title of Walker’s book is "Unintimidated," which sends the clear message that his opponents don’t bother him even a little bit.

I have my doubts, no matter how good he is on the campaign trail, whether that kind of dogmatic and aggressive stance will be enough to carry him to the presidency.