Boston Marathon Charity Runners Race to Find Donors

Tens of thousands of fundraising “athons’’ nationwide mean donors suffer fatigue. As a result, some participants are struggling to raise the $4,000 the Boston Athletic Association requires of charity runners for the Boston Marathon.

This year more than 2,300 people will officially run the Boston Marathon for more than 130 charities; that is up from four charities with 500 runners in 1994, the first year the BAA formalized its charity marathon program.