Biden unveiled his plan during his first day in office, proposing an eight-year pathway to citizenship for many of the estimated 11 million undocumented immigrants in the United States.But the political landscape is much changed from a decade ago. For one, Biden's plan faces an evenly divided Senate, where under the existing rules they will once again need large Republican support to pass any legislation on immigration. And so far, no bipartisan coalition has emerged in the Gang of Eight tradition.