Back in 1988, the effect on apportionment, which also affects the Electoral College, prompted a lawsuit by 40 members of Congress, Pennsylvania and the Federation for American Immigration Reform to prevent the Census Bureau from counting illegal immigrants. The complaint was dismissed by the U.S. Supreme Court for lack of standing.
"People who have no right to be in this country should not be counted," said federation President Dan Stein. "It's awfully hard to explain to U.S. citizens why they keep losing political representation to states like California because of people who broke immigration laws."
Vargas and others questioned the boycott organizers' political motivations, noting that most of them were conservative.
Rivera acknowledged that his coalition endorsed George W. Bush in 2004 and slightly favored Republican presidential nominee John McCain over Democrat Barack Obama by a vote of 52% to 48% last year. But he denied that the boycott was aimed at aiding Republicans.
He said his group was concerned that federal funds obtained in part through the counting of illegal immigrants would be used against them to increase arrests and harassment by local law enforcement.
Rivera also said he wanted to use the boycott as a way to pressure Congress to pass legislation offering legalization to illegal immigrants.
So far, his group appears to have gained little traction in California. A group of affiliated Latino pastors plans to meet in the next week or two to discuss the boycott call but has made no decision yet, according to Jose Caballero, a Camarillo minister.
But other Latino leaders say they are nervous about the boycott.
"The fact that they are getting a lot of media attention concerns us that they could do a lot of damage," said Brent Wilkes, executive director of the League of United Latin American Citizens in Washington, D.C.
Using the same slogan as their successful citizenship campaigns -- "Ya es Hora," or "It's Time" -- Spanish-language media, community groups, labor unions and churches plan to launch a far-reaching campaign urging mass participation in the census.
Boycott or not, they have their work cut out for them. Although the Census Bureau by law must keep information confidential, that message has not entirely gotten through.
At Our Lady Queen of Angels Church near Olvera Street, migrant farm worker Juan Garcia said he would not participate because of fears of how the information might be used.
Another illegal immigrant, Julian Chavez, also voiced concern that census workers would contact him at work, go to his home and ask nosy questions. Asked if he would participate, Chavez hedged his answer.
"Will there be consequences?" he asked. "I have my family to think about."
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teresa.watanabe@latimes.com