Amanda Curtis, the new Democratic United States Senate candidate, will not be able to jump-start her campaign using money left in Senator John Walsh’s bank account from his defunct campaign. Senator Walsh, who dropped out of the race in a plagiarism scandal this month, can only give the legal limit of $2,000 to his replacement candidate’s campaign, according to Federal Election Commission rules. Ms. Curtis, a one-term state legislator from Butte, was selected as his replacement in a special nominating convention on Saturday. Her Republican opponent, Representative Steve Daines, has $1.7 million in his campaign account. Senator Walsh had more than $713,000 in his campaign account as of June 30, the last reporting deadline.