The Democrats’ two biggest presidential draws will be crisscrossing New Hampshire in the next few days, within 24 hours of each other, giving voters in the first primary state a unique chance to evaluate what kind of standard bearer each would be for the party.

Senators Clinton and Obama are scheduled to be in the Granite State between tomorrow and Monday, and their itineraries will mirror each other, with political house parties and town hall meetings.

The back-to-back barnstorming comes as the race to secure cash for 2008 presidential campaigns is hitting an early peak and as polls show Mrs. Clinton ahead of Mr. Obama by a large margin, 39% to 19%.

For Mr. Obama, the trip will serve as the last leg of a campaign swing that includes about two dozen stops in Iowa and Illinois. The trip comes after the freshman senator announced that he is skipping a Nevada forum later this month that will be the first opportunity to see many of the 2008 Democratic presidential candidates side by side. For Mrs. Clinton, the trip comes two weeks after a dizzying campaign trip to Iowa and before scheduled trips to South Carolina, California, and Nevada.

While the two campaigns won’t have to worry about bumping into each other in New Hampshire — she’ll be there Saturday and Sunday; he’ll be there Monday — they will be working to lock up support from the same party activists.

“It’s not optimal for either one of them,” a professor of government at Dartmouth College in Hanover, Linda Fowler, said. “There is only so much attention and only so many activists to go around.”

Preparations for both visits have been under way all week. Secret Service agents began arriving at Concord High School in the state’s capital on Wednesday for an event Mrs. Clinton is holding tomorrow, an English teacher at the school, Joanne McGlynn, said yesterday. “We’ve had presidential candidates here every primary season,” Ms. McGlynn, who is one of the event’s coordinators, said. “This year is pretty amazing. This is the third candidate we’ve had come to the school already.”

A former Democratic governor of Virginia, Mark Warner, visited the school a few weeks before ending his short-lived run for the White House in October, and a former Democratic governor of Iowa, Tom Vilsack, visited in December. In addition to a number of other candidates, the school hosted President Clinton in 1992 and in 1996.

Ms. McGlynn said everyone is teeming with excitement over Mrs. Clinton’s visit — especially the female staff and students — and that she was “heartbroken” when she discovered that Mr. Obama would be going to the University of New Hampshire instead.

A state representative from Nashua, Bette Lasky, who is hosting a party for Mr. Obama at her home on Monday, also hosted house parties for John Edwards and Senator Lieberman in 2004 and had Vice President Gore as an overnight guest in 1999. However, she said this visit “seems to have a life of its own.” And while she’s getting a “big pot of coffee” ready for Mr. Obama’s visit, she is also going to a neighbor’s house on Sunday to meet Senator Clinton.

Political analysts said the two candidates should expect tough questions on the Iraq war, American relations with Iran, and a number of domestic issues. When Mrs. Clinton was in Iowa late last month, the 2002 vote for the Iraq war was the one issue that she found herself having to defend.

The trip will be Mrs. Clinton’s first to New Hampshire in more than a decade. Mr. Obama was there in December, but Monday will be his first time in the state as an official candidate.