democratic rivals

Catholic voters may hold the key to Pennsylvania's presidential primary, and the two Democratic rivals are campaigning hard for their support.

Co-host Renee Montagne talks with NPR News Analyst Cokie Roberts about whether there is such a thing as the "Catholic vote" and how well Hillary Clinton has to do against Barack Obama if she wants to stay in the race.

Hillary Clinton and Barack Obama sparred in a debate Wednesday in Philadelphia. Also this week, John McCain gave his first major economic speech as the presumptive GOP nominee.

Polls show a desire for change of party in the White House, but McCain is running even with Democratic rivals.

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