WEST DES MOINES, Iowa - New Jersey Gov. Chris Christie brought some of his East Coast attitude to the Hawkeye State today, warning Iowans that if they disappointed the Romney team at the caucuses next week, he'd be back, "Jersey-style."

"I love being with Mitt and Ann but let me tell you, you people disappoint me on Tuesday, you don't do what you are supposed to on Tuesday for Mitt Romney, I will be back Jersey-style people," Christie said. "I will be back."

"Take nothing for granted," Christie said. "Elections are decided by the people who show up, by the people who vote, by the people who care about their country enough to be out here on Friday Morning in Iowa, in the rain, in the cold, because you love your country and because you believe this man can help lead this country back to greatness."

Romney, estimating the crowd size to be 1,500, a number that was high for the 600 or so people gathered in the parking lot of the Hy-Vee grocery store, suggested to voters standing in the bad weather that they could now brave whatever the weather might be on caucus day.

"No one does it better than Iowa," Romney said.

"We are out in the cold and wind because we care about America," Romney said before slipping in a jab at the president, telling the crowd that Obama has just "finished his 90th round of golf" on his Hawaiian vacation.

"If you can get out here in this cold and wind and rain, you can sure get out on Tuesday night and find a few people to bring with you," Romney said. "I need your help."

While Romney heads to New Hampshire this afternoon for a few events before returning to Iowa Saturday evening, his wife, Ann, will accompany Christie during several campaign events in Iowa today.

The increase in crowd size at Romney's events - a visible difference from those seen at his events in the state in November - has forced the campaign to add significantly to its advance team, tripling it in size in the past week, a staffer said.

Romney will pick up again with an aggressive campaigning schedule in Iowa Sunday, taking his bus tour down the western part of Iowa before heading east, making stops in Davenport and Dubuque before going back to Des Moines for the night of the caucuses.