SAN FRANCISCO  In many ways it is a typical map, showing states, highways, cities and streets.

But also dotting the online display are thousands of red arrows, marking spots from Bryn Mawr, Pa., to Jamacha, Calif., identifying the addresses of donors who supported Proposition 8, which outlawed same-sex marriage in California.

It is exactly those arrows that concern supporters of the measure, who say they have been regularly harassed since the election  with threatening e-mail messages and sometimes boycotts of their businesses.

“Some gay activists have organized Web sites to actively encourage people to go after supporters of Proposition 8,” said Frank Schubert, the campaign manager for Protect Marriage, the leading group behind the proposition. “And giving these people a map to your home or office leaves supporters of Proposition 8 feeling especially vulnerable. Really, it is chilling.”

So chilling, apparently, that supporters have filed suit in Federal District Court in Sacramento seeking a preliminary injunction of a state election law that requires donors of $100 or more to disclose their names, addresses, occupations and other personal information. In particular, the suit seeks to stop the final filing for the 2008 election, which is due Jan. 31. That filing includes donations made in the closing days of the campaign, when the proposition surged to victory.