With a victory in the state of Wisconsin,Texas Senator Ted Cruz slowed Donald Trump's pushto capture the Republican Party's presidential nomination.Cruz called his victory in the Wisconsin Republican primaryon Tuesday a "turning point."He asked Republicans to rally around his candidacy to stop Trump.Edison Research questioned people who voted in the primaryfor the Associated Press and U.S. television networks.The researchers found that some Wisconsin voterswere concerned and frightened about a possible Trump presidency.The businessman did not make a public appearance Tuesday nightbut his campaign released a statement attacking Cruz.It read, "Ted Cruz is worse than a puppet-- he is a Trojan horse being used by the party bossesattempting to steal the nomination from Mr. Trump."The Wisconsin defeat is one of several setbacksfor the Trump campaign in the past few days.Last week, Trump had to explain his position on abortionafter saying that "there has to be some form of punishment"for women who had the operation.Doctors use an abortion to end a pregnancy,resulting in the death of the fetus.Earlier, police in Florida brought charges against Trump's campaign managerafter an incident involving a female reporter.The manager was accused of hurting the womanwhen she tried to question the candidate at a campaign event.In other well publicized comments,Trump said that European countriesare "ripping off the United States"and want to break up the North Atlantic Treaty Organization.As world leaders met recently to discuss waysto limit the spread of nuclear arms,Trump said that South Korea and Japan should develop nuclear armsto deal with the threat from North Korea.When reporters raised questions about the presidential race on Tuesday,President Barack Obama said,"We've got big issues around the world.People expect the President of the United Statesand the elected officials in this countryto treat these problems seriously."This month, the race for the Republican presidential nominationmoves to the northeastern states of New York and Pennsylvania.A recent poll found that Ted Cruz is now tied with Trump in the national survey.A month ago, the businessman was leading the Texas senatorby nearly 20 percentage points.With the victory in Wisconsin,Cruz added the support of 30 more delegatesto the Republican convention this summer.But Trump has 743 delegates compared to 517 for Cruz.A candidate will need 1,237 delegates to win the nomination.