On the heels of a bipartisan proposal to overhaul the nation's immigration laws, President Barack Obama sought to build on political momentum Tuesday, outlining broad proposals for putting millions of illegal immigrants on a clear path to citizenship while cracking down on businesses that employ people illegally and tightening security at the borders. He hailed the senators but left unresolved key details that could derail the complex and emotional effort.
Potential Senate roadblocks center on how to structure the avenue to citizenship and on whether legislation would cover same-sex couples — and that's all before a Senate measure could be debated, approved and sent to a Republican-controlled House, where opposition is sure to be stronger.

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