Here are today's headlines in the presidential campaign, from The Associated Press.

Pelosi says superdelegates have right to vote their conscience, Democratic race should go on

Clinton likens herself to legendary film boxer Rocky, says she won’t quit

Obama stops at Pa. factory as he makes his case that he’ll protect jobs

Party switching picks up in late primary states as voters seek to cast historic vote

TODAY'S VIDEO: Batter up. Bush throws out first pitch.

ON THE CAMPAIGN TRAIL
Hillary Rodham Clinton and Barack Obama campaign in Pennsylvania. John McCain holds a town-hall style meeting in Virginia.
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QUOTE OF THE DAY:
“The bottom line is, this is the first Oregon presidential primary I have ever voted in my life that actually could matter, and I am not going to pass up that chance just because I am registered with the wrong party.” — Matthew Buckingham, 45, a stay-at-home father and lifelong Republican who temporarily switched his party affiliation to vote in Oregon’s Democratic primary.
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STAT OF THE DAY
Only 10 percent of Pennsylvanians are between age 18 and 24, a group that Democrat Barack Obama has captured in other states.

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