At a time when the prospects for immigration overhaul seem most dim, supporters have unleashed a secret weapon: a group of influential evangelical Christian leaders.

Normally on the opposite side of political issues backed by the Obama White House, these leaders are aligning with the president to support an overhaul that would include some path to legalization for illegal immigrants already here. They are preaching from pulpits, conducting conference calls with pastors and testifying in Washington  as they did last Wednesday.

“I am a Christian and I am a conservative and I am a Republican, in that order,” said Matthew D. Staver, founder and chairman of Liberty Counsel, a conservative religious law firm. “There is very little I agree with regarding President Barack Obama. On the other hand, I’m not going to let politicized rhetoric or party affiliation trump my values, and if he’s right on this issue, I will support him on this issue.”

When President Obama gave a major address pushing immigration overhaul this month, he was introduced by a prominent evangelical, the Rev. Bill Hybels of Willow Creek Community Church in Illinois. Three other evangelical pastors were in the audience, front and center.