This year's heavy volume of automated political phone calls has infuriated countless voters and triggered sharp complaints from Democrats, who say the Republican Party has crossed the line in bombarding households with recorded attacks on candidates in tight House races nationwide.

Some voters, sick of interrupted dinners and evenings, say they will punish the offending parties by opposing them in elections today. But campaign activists say many voters are uncertain about the calls' source.

Democrats said Monday that GOP operatives intended the messages to confuse voters and help Republicans, a charge the party denies. After citizens' complaints in New Hampshire, however, the National Republican Congressional Committee agreed to end the calls to households on the federal do-not-call list, even though the law exempts political messages from such restrictions.

Whether "robo-calls" are positive or negative, mean-spirited or humorous, thousands of Americans are sick of them, according to campaign organizations that have been fielding complaints over the past two weeks.

An Ohio woman, who did not leave her name, called The Washington Post in tears Monday, saying she could not keep her phone line open to hospice workers caring for her terminally ill mother because of nonstop political robo-calls.

Pamela Lorenz, a retired nurse in Roseville, Calif., called her own experience "harassment, as far as I'm concerned. If I were voting right now, the opponent who's doing this, he'd be off my list for throwing that much trash."

Double-edged sword

Many voters hang up as soon as a robo-call begins -- without waiting for the criticisms or the NRCC sign-off at the end -- so they think it was placed by the Democratic candidate named at the start, said Sarah Feinberg, spokeswoman for the Democratic Congressional Campaign Committee. "Our candidates are inundated with phone calls from furious Democrats and independents saying ... 'I'm outraged and I'm not going to vote for you anymore,' '' she said.

Karyn Hollis, a Villanova University English professor who supports Democrat Lois Murphy in her bid to oust Rep. Jim Gerlach, R-Pa., said she has received numerous robo-calls attacking Murphy.

A quick hang-up can lead the recipient to conclude that Murphy supporters placed the call, she said. Listening to the full message subjects the voter to a litany of attacks against Murphy.

"It's a double thing," Hollis said. "Either way they win."