- Donald Trump won the Republican primary in New York on Tuesday
- David Gergen: Psychologically, the tide could now reverse in Trump's direction
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)Two weeks ago, after his decisive win in Wisconsin, it appeared that the odds for winning the GOP presidential nomination had suddenly and unexpectedly shifted in favor of Sen. Ted Cruz.