* Hispanic activists say drive is "heavy on enforcement"
* Republicans split on "amnesty," but see room for compromise
By Tim Gaynor
PHOENIX, Jan 28 (Reuters) - Illegal immigrant Maria Duran sat up all night outside the Arizona state capitol and prayed for an immigration overhaul before welcoming news Monday of a proposal that could give her legal status but left her wanting more clarity.
A bipartisan group of Republican and Democrat senators announced "tough but fair" steps that they hoped could be passed by Congress this year to give 11 million illegal immigrants a chance to eventually become American citizens.
"It's the best moment for immigration reform in years, but we need to see more details," said Duran, 50, a homemaker who left Mexico 28 years ago, as she huddled with activists urging reform outside the capitol in Phoenix.
The plan, the first concerted drive for comprehensive reform since a similar overhaul was defeated by Republicans in Congress in 2007, would offer probationary legal status to immigrants who register with the government and pay a fine and any back taxes.
They will also have to learn English, continue to pay taxes and demonstrate a work history in the United States to apply for legal permanent residency.
But the proposal - with plenty of details still to be worked out - also seeks to ensure as a first step that the porous border with Mexico is secure and that foreigners temporarily in the United States return home when their visas expire.
Some activists were encouraged by the level of bipartisan support from the four Democrat and four Republican senators who proposed the present measure, including Charles Schumer, a New York Democrat, and John McCain, a veteran Arizona Republican.
But they also worried that the proposal made tightening enforcement - including adding agents and additional surveillance systems to the southwestern border - a precondition for all other measures in the package.
"It's really heavy on enforcement. That has always been one of the wedge issues in the community for activists," said Gaby Pacheco, a campaigner in Florida who was brought to the United States from Ecuador at age eight.
While the government's own figures showed arrests on the southwest border at a 40-year low in 2011 and deportations at a record high, Pacheco said, "I don't think Republicans are ever going to be satisfied with enforcement measures."
'AMNESTY' OR 'EARNESTY'?
For Juana Garcia, a 27-year-old undocumented agricultural worker from Mexico, immigration reform could ease the fear she and her husband have of deportation and being separated from their five children - all of whom are U.S.-born citizens.
The pair are seasonal workers who drive to Wisconsin to work the crops there before returning to Florida's strawberry fields and orange groves - all the while worried that they will be pulled over for a traffic stop and detained.
Garcia, speaking in Spanish, said she has no problem with provisions requiring immigrants to pay fines and back taxes before getting a green card. But she said that while immigrants want to learn English, they may need help finding time or child care to attend classes after laboring in the fields all day.
The immigration reform proposal met with a decidedly mixed response from Republican leaders nationally, who said that while they supported some kind of immigration overhaul, they were unclear if this was the right one.
"My understanding is it's basically just saying that we're going to give everybody amnesty," said Steve Munisteri, the Republican Party of Texas Chairman.
"But we do need immigration reform that recognizes the fact that we have a lot of people already here, that are necessary to be here, that are hard-working, law-abiding people that would add to the country," he added. "We should figure out a way for those people to have a way to stay."
Some others in the party, which lost Hispanic votes in the November election that gave President Barack Obama a second term, saw support for the measure as way of building bridges to Latinos, who are the country's fastest-growing demographic.
"There's no question about it. We've got to deliver a better message to Hispanics and immigrants ... a segment of people we lost badly," said Chad Connelly, the South Carolina Republican Party Chairman, adding that legislation could find support if it involved better border security and assimilation measures.
"I've heard some people say this is more like 'earnesty' than 'amnesty. 'Earnesty,' as in earning their way to citizenship," he added. (Additional reporting by Ian Simpson in Washington, David Adams in Miami, Saundra Amrhein in Tampa, Corrie McLaggan in Austin, Harriet McLeod in Charleston Virginia and Verna Gates in Birmingham, Alabama; Editing by Cynthia Johnston and Doina Chiacu)