MESILLA, N.M. (AP) _ While George Bush talked about education and Al Gore the environment, their campaigns Saturday skirmished over another hot topic: which candidate is running harder.

Bush spokesman Scott McClellan started it all after a reporter asked why Bush had only one event Friday and none scheduled for Sunday.

That sent McClellan to the scheduling charts. He quickly came up with a list of Bush activities after the GOP convention that he insisted showed Bush working harder.

After the GOP gathering in Philadelphia, Gore over five days made 22 stops in five states that represent 138 electoral votes, beamed McClellan to reporters. Bush took two days off.

It didn't take long for Gore's people to weigh in.

This weekend Gore was on four-day 400-mile trip down the Mississippi River and will follow that with more campaigning. Altogether there will be 20 events in six states, representing 86 electoral votes, over seven days, said Gore spokesman Chris Lehane.

``It is Al Gore who works 24/7 and George W. Bush whose lightweight schedule is matched only by his lightweight agenda,'' chided Lehane. And, he added, Gore's not taking two days off.