Sen. Kyrsten Sinema could be the 50th vote for — or against — Biden's ambitious legislation. So what does she want?

There are only two ways that any of President Biden’s big post-pandemic plans — modernize America’s infrastructure, combat climate change, expand education and shore up the safety net for working families— are surviving a 50-50 Senate. Otherwise, much of Biden’s legislative agenda is DOA. And Democratic Sen. Kyrsten Sinema of Arizona could be the one to kill it.