Thousands of immigration reform activists are planning a rally Sunday on Washington, D.C.'s National Mall.

At stake are millions of undocumented workers and Latinos who voted for President Barack Obama in 2008.

They say the president has failed to live up to his promise to tackle immigration during his first year in office.

Rev. Samuel Rodriguez heads the National Hispanic Christian Leadership Conference. He said Obama must pass immigration reform by the end of April or face the consequences in November.

"We have 12 million people undocumented," Rodriguez said. "Deportations continue. It's becoming more and more difficult for these undocumented even to get jobs and provide the financial resources for the basic necessities of their households."

The president is now backing a bipartisan immigration bill that says illegal immigrants must admit they broke the law to become citizens.

The measure is sponsored by Sens. Charles Schumer, D-N.Y., and Lindsey Graham, R-S.C.