Most evangelicals vote for Republican candidates, and for the last three decades the Republican Party has coveted evangelical votes by emphasizing the GOP's close link to Christian faith and values. But with Mitt Romney now the Republican candidate for President, many are asking whether his Mormon faith will be a stumbling block for evangelicals.

Last week a controversy erupted when Liberty University, the country's largest Christian college, invited Romney to be the commencement speaker. Some students and alumni are upset that the school invited a non-Christian to speak. They accuse Liberty of putting partisan politics ahead of it's commitment to Christ.

The Liberty U. controversy highlights a growing debate about the relationship between Mormonism and Christianity: are Mormons Christians? In these videos two prominent pastors take different perspectives. What are you telling your church members? And should it impact the way we vote?

Joel Osteen: Mormons are Christians

Rick Warren: Mormons ...