Clinton ridiculed Romney's tax plan and said that Obama is the only one who has a budget proposal that adds up. He also praised Obama's health care overhaul and said that reforms included in it would allow companies to keep their health care costs down and allow them to give employees raises.
Curt Cashour, a Romney campaign spokesman in Virginia, said Clinton was trying to mask Obama's failures.
"With no record to run on and no vision for the future, the Obama campaign is resorting to false, discredited attacks and a cynical closing message urging voters to choose 'revenge,'" Cashour said.
Polls show Romney and Obama locked in a toss-up race for the 13 electoral votes that Virginia last awarded to Obama in 2008. The state is one of a handful of undecideds that will determine which candidate wins Tuesday's election.
Until 2008, Republicans had won 10 consecutive presidential races in Virginia. Democrats generally conceded the state along with the rest of the South to the GOP, and it was an afterthought in presidential politics. Now, not a day passes without a major presence by the Obama or Romney campaigns.
Saturday's final campaign appearance, in Prince William County about 35 miles west of the White House, was scheduled to begin at 10:35 p.m.
A little more than a month ago, Obama had a clear lead over Romney in Virginia, but it has shrunk since Obama's lethargic performance in the first of their three presidential debates.
Still, some Republicans are on edge.
"It's still going to be too close to call. I'm hoping obviously that Romney and Ryan win because he's just driving the country into ruin, Obama is," said Rick Qualy, a retired Army sergeant major who lives in Chester. "If Obama wins there's not much we can do but put up with it — and go out and buy another gun and maybe a couple thousand rounds of ammo because that'll be outlawed soon too."
Brock Vergakis, reporting from Chesapeake, Va., and Brian Bakst, reporting in Richmond, contributed to this report.