Geraldo Mora/Getty Images (CNN) With his decisive victory in Wisconsin, Sen. Ted Cruz has not only shaken up the Republican presidential race, but heading into the homestretch, he has suddenly become the odds-on favorite to win the nomination in Ohio.  With…

(CNN) Some years ago, I asked an eminent presidential historian, David Herbert Donald, what asset a president needs most. He thought briefly and answered, “A friend.” That response has resonated with me ever since and instantly recurred Sunday when sad news arrived…

(CNN) Even as we in the commentariat dig into the entrails of Super Tuesday voting — for example, asking how many left-handed, 24-year-old Lutherans caucused in Minnesota and how they voted — we should not overlook the larger significance of this…

Tracy Palandjian is CEO of Social Finance, the nonprofit that developed the South Carolina and Connecticut Pay for Success projects. David Gergen is a professor of public service and co-director of the Center for Public Leadership at the Harvard Kennedy School.…