For most Republicans in the U.S. Congress, a large gathering of Hispanic voters to discuss immigration would be politically perilous - an invitation to complaints about the party's longtime resistance to measures aimed at helping undocumented immigrants.

But when Republican Rep. Jeff Denham walked into a meeting with hundreds of his Hispanic constituents at a church in California's Central Valley this month, he was met with applause, praise and a hand-lettered "Thank You" sign.

Denham, 46, is a rarity in the U.S. House of Representatives: one of only three Republicans in the chamber's 231-member majority who support a Democrat-sponsored bill that would give millions of undocumented immigrants a legal pathway to U.S. citizenship. (Reuters)