Associated Press
President Barack Obama waves as boards Air Force One on Tuesday, Oct. 23, 2012 at West Palm Beach Airport, in West Palm Beach, Fla. after his final debate Monday night against Republican candidate Mitt Romney at Lynn University in Boca Raton, Fla.

DELRAY, Fla. — President Barack Obama says the most serious issue in the White House race is who voters can trust.

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Obama is aiming to draw a contrast with Republican rival Mitt Romney following their final presidential debate. The president says that while Romney is shifting his positions on key issues, voters 'can trust that I say what I mean."

The president is also putting fresh emphasis on his second-term agenda, following criticism that he hasn't provided enough specifics about what he would do with four more years in office.

At a rally Tuesday in Florida, Obama ticked through a series of previously introduced policy proposals, including boosting education spending and manufacturing.