AP Photo/Charles Dharapak

Republican presidential candidate Mitt Romney greets an overflow crowd as he campaigns at PR Machine Works in Mansfield, Ohio, Monday.

MANSFIELD, Ohio (AP) — It's all about Ohio — again.

The economy has improved here, and so has President Barack Obama's standing, putting pressure on Republican Mitt Romney in a state critical to his presidential hopes.

No Republican has won the White House without winning Ohio, and Romney hopes to catch Obama here by slashing at his jobs record in working-class regions.

"America doesn't have to have the long face i...