Final countdown: Less than 48 hours to Election Day

>>> thanks, with two days now until election day , the campaigns are making their final arg arguments to voters. and with only a tiny margin separating the candidates, they know every vote counts. kristen welker is traveling with the president.

>> reporter: it's the sprint to the finish. by tuesday both candidates will crisscross all the major swing states and travel a combined 8,000 miles seeking out the few remaining undecided voters in this race that remains deadlocked.

>> after four years as president, you know me.

>> it is time to lead america to a better place. you make me feel

>> reporter: from katy perry in wisconsin --

>> reporter: to dave matthews in have virginia, the stars turned out for the president saturday. while nascar legend richard petty revved things up in iowa for mitt romney . kid rock opening romney 's biggest rally in ohio on friday. but this weekend is all about closing arguments. on saturday the president made his case in ohio, wisconsin, iowa , and virginia, where he enlisted former president bill clinton to help had him close the gap with white working class voters, and to remind them about recent boone times under a democratic president.

>> barack obama is a proven cooperator.

>> everybody is doing their fair share , and everybody is playing by the same rules. that's what we believe. that's why you elected bill clinton in 1992 .

>> reporter: mitt romney made stops in new hampshire, iowa , and colorado can on saturday be and continued to push his key argument -- the economy will be stronger under his presidency.

>> from day one, i'm going to go to work to help americans get back to work.

>> reporter: and he took aim at president obama for saying this on friday.

>> don't move, vote. vote. voting is the best revenge .

>> reporter: romney suggesting the president was encouraging people to vote for the wrong reasons.

>> he asked his supporters to vote for revenge.

>> boo!

>> i ask the american people to vote for love of country.

>> reporter: the obama campaign dismissed the flap calling it a small issue. now with mr. obama leading in some key battleground states , romney is making a late play for traditionally blue states including pennsylvania where he'll campaign later today. for "today," kristen welker, nbc news, concord, new hampshire.