RICHMOND — Two political heavyweights fighting for Virginia’s open U.S. Senate seat came out swinging Monday in their only debate in front of a statewide television audience.

Democrat Tim Kaine and Republican George Allen, both former governors, presented two vastly different visions on health care, taxes, abortion and a slew of other issues in a 60-minute sparring match that marked their harshest encounter in what has otherwise been a rather wonkish race.