In the hours before Election Day, as inevitable as winter, comes an onslaught of dirty tricks -- confusing e-mails, disturbing phone calls and insinuating fliers left on doorsteps during the night.
The intent, almost always, is to keep folks from voting or to confuse them, usually through intimidation or misinformation. But in this presidential race, in which a black man leads most polls, some of the deceit has a decidedly racist bent.
Complaints have surfaced in predominantly African-American neighborhoods of Philadelphia where fliers have circulated, warning voters they could be arrested at the polls if they had unpaid parking tickets or if they had criminal convictions.
Over the weekend in Virginia, bogus fliers with an authentic-looking commonwealth seal said fears of high voter turnout had prompted election officials to hold two elections -- one on Tuesday for Republicans and another on Wednesday for Democrats.
In New Mexico, two Hispanic women filed a lawsuit last week claiming they were harassed by a private investigator working for a Republican lawyer who came to their homes and threatened to call immigration authorities, even though they are U.S. citizens.
In Pennsylvania, e-mails appeared linking Democrat Barack Obama to the Holocaust. "Jewish Americans cannot afford to make the wrong decision on Tuesday, Nov. 4," said the electronic message, paid for by an entity calling itself the Republican Federal Committee. "Many of our ancestors ignored the warning signs in the 1930s and 1940s and made a tragic mistake."
Laughlin McDonald, who leads the ACLU's Voting Rights Project, said he has never seen "an election where there was more interest and more voter turnout, and more efforts to suppress registration and turnout. And that has a real impact on minorities."
The Obama campaign and civil rights advocacy groups have signed up millions of new voters for this presidential race. In Ohio alone, some 600,000 have submitted new voter registration cards.
Activist groups say it is this fresh crop of ballot-minded citizens that makes some Republicans very nervous. And they say they expect the dirty tricks to get dirtier in final hours before Tuesday.
"Oh, there's plenty of time for things to get ugly," said Zachary Stalberg, president of The Committee of Seventy, a Philadelphia-based government watchdog group that is nonpartisan.
Other reports of intimidation efforts in the hotly contested state of Pennsylvania include leaflets taped to picnic benches at Drexel University, warning students that police would be at the polls on Tuesday to arrest would-be voters with prior criminal offenses.
In his Jewish neighborhood, Stalberg said, fliers were recently left claiming Obama was more sympathetic to Palestinians than to Israel, and showed a photograph of him speaking in Germany.
Such tactics are common, and are often impossible to trace. Robo-calls, in which automated, bogus phone messages are sent over and over, are very hard to trace to their source, say voting advocates.
In Nevada, for example, Latino voters said they had received calls from people describing themselves as Obama volunteers, urging them to cast their ballot over the phone.
The calls were reported to Election Protection, a nonprofit advocacy group that runs a hot line for election troubles. The organization does not know who orchestrated them.
"The Voting Rights Act makes it a crime to mislead and intimidate voters," said McDonald. "If you can find out who's doing it, those people should be prosecuted."
E-mail assaults have become increasingly popular this year, keeping pace with the proliferation of blogging and Obama's massive online campaign efforts, according to voting activists.
"It is newer and more furious than it ever has been before," said Jonah Goldman of the advocacy group Lawyers' Committee for Civil Rights Under Law.
And Republicans are not exempt. "Part of it is that election campaigns are more online than ever before," said Goldman. "During the primaries, a lot of Web sites went up that seemed to be for [GOP candidate Rudy] Giuliani, but actually were attack sites."
New York City's former mayor and his high-profile colleagues Fred Thompson and Mitt Romney were also targeted in fake Internet sites that featured "quotes" from the candidates espousing support for extreme positions they never endorsed.