“As an unofficial candidate early this year, Mr. Walker got off to a hot start with several strong speeches and impressive poll numbers in Iowa and other key states. But a series of gaffes hurt him among some Republican leaders and donors, and his lead in Iowa polls has softened recently as rivals like Senator Ted Cruz, Rick Perry, Donald J. Trump and Ben Carson have gained ground or campaigned more than Mr. Walker….”
Via Scott Walker Announces Run for President, Looking to Regain Momentum.