ON THE TRAIL: Wednesday, April 2, 2008

Compiled by Jonathan Helman, CNN Washington Bureau

*Hillary Clinton tours the Pittsburgh Life Sciences Building and hosts an economic summit in Pittsburgh, Pennsylvania.

*John McCain attends a pledge of allegiance ceremony and gives a speech in Annapolis, Maryland. He also gives a speech, participates in a panel discussion, and has a meet and greet in Pensacola, Florida.

*Barack Obama is in Pennsylvania. He gives a speech to the AFL-CIO in Philadelphia, holds an event in Wallingford, and attends a rally back in Philadelphia.