The incumbent Republican congressman from Kiron asked for the votes when he campaigned by speaking to about 50 people at the county GOP headquarters in Le Mars.
"What's ahead of us is a destiny election for the United States of America," King said. "We've seen what Barack Obama has done and I will tell you that I can't connect with the man's values -- I don't think he sees the same America that we do."
King singled out economic policy as part of his appeal for support for Romney.
"Remember he's a Keynesian economist on steroids," King said. "That means he will borrow and spend all the money he can borrow and spend because he believes the more money you spend, the more prosperity you've created by spending money."
King said the people at the Republican gathering know that doesn't work, but Obama believes it does.
"It doesn't work for our families, it doesn't work in our businesses, it doesn't work for the state government of Iowa, the city of Le Mars or the county of Plymouth," King said.
He said he was looking forward to a new administration in the White House for reasons that included the current federal debt.
King said the share of the national debt for his granddaughter, Reagan, was $52,288 on her second birthday a few weeks ago.
"We cannot sustain this; we become one huge Greece and no one can bail us out," he said.
Beyond economics, the debt is a moral issue, he said.
"It is immoral for us to mortgage the labor of children yet to be born to have to pay off the debt that we run up in our lifetime because we don't have the discipline to solve that problem in our lifetime," King said.
He said Iowa is one of five swing states in the presidential election Tuesday.
"You turned out a lot of votes here in 2004 for (George) Bush's re-election," King said.
The same kind of effort is needed Tuesday, he said.
"I want to wake up Wednesday not with this knot in my gut but a smile on my face that I can't wipe off all day," King said.
King is being opposed in his re-election bid by Democrat Christie Vilsack, of Ames.
He described the few days left in the campaign as the end of the battle to be elected to represent the 39 counties in the congressional district with new boundaries after the 2012 U.S. Census.
He said he was proud of what had been accomplished during his 10 years in the U.S. Congress.
King said a four-lane Highway 20 had been his No. 1 transportation priority.
Before Thanksgiving, the ribbon will be cut on another 26.2 miles of paving of Highway 20 from Rockwell City into Sac County and Highway 71, he said.
"That's going to leave about 31 miles to link that up with the Moville four-lane and that will be the last leg; we will get this done and it won't take that long, we're almost there," King said.
He also touted the progress that's been made on energy.
The district he represents produces more renewable energy than any other of the more than 400 congressional districts in America, he said.
"The No. 1 renewable energy producing congressional district in America -- and Christie Vilsack doesn't think that's good enough," King said. "Well I don't either; let's keep it up. But it's not any reason to be critical of an accomplishment when you're standing on the top rung in the ladder."
He said he'd hoped to gain the backing for his re-election bid from the five largest ag groups in Iowa.
Endorsements for him have come from five dozen ag groups, King said.
"Sixty ag organizations supporting this campaign, zero for the wife of the U.S. Secretary of Agriculture," he said in reference to Tom Vilsack who is the husband of King's opponent.
He told the Republicans they probably had not seen two polar opposites in a congressional campaign as he and Christie Vilsack.
"We're going to see people crossover that are normally Democrats that come to support me, that's happening fairly continually," King said.
He compared the political race for the Fourth District congressional seat to running a race by saying "you don't jog to the finish line."
"That's what we're all doing here. The (voter) turnout in Plymouth County is so, so important," King said.