- Republican rules will likely limit the delegates' choice to either Cruz or Trump, David Gergen says
- There are 16 primaries and caucuses remaining
David Gergen is a senior political analyst for CNN and has been a White House adviser to four presidents. A graduate of Harvard Law School, he is a professor of public service and co-director of the Center for Public Leadership at the Harvard Kennedy School. Follow him on Twitter: @david_gergen. The opinions expressed in this commentary are his.
(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.