CNN

With his wife, Cindy, Sen. John McCain waves to the crowd Saturday in Newport News, Virginia.

(CNN) – Just three days before Election Day, Sens. Barack Obama and John McCain spent Saturday campaigning across battleground states.

"We are three days away from changing America," Obama said at a late rally in Springfield, Missouri, his third stop on Saturday. Still, Obama added, "We can't afford to slow down or let up in these next few days ... not when there's so much at stake."

Sen. John McCain capped off a day of campaigning in Virginia and Pennsylvania with a sidetrip to New York, where he appeared on "Saturday Night Live" on the last weekend before the presidential election. McCain has made two previous appearances on the NBC show, but it's the first one this year.

The Arizona senator appeared in the opening skit, next to former cast member Tina Fey reprising her role as his running mate, Alaska Gov. Sarah Palin. He made a second appearance during the "Weekend Update" segment that skewers current events.

Earlier in the day, McCain told Springfield voters in northern Virginia that the area is key to a Republican victory.

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