evidence: President Biden said Thursday he would support changing the Senate's filibuster rules for Congress to pass a federal law codifying Roe v. Wade. [...] The big picture: Democrats have previously attemptedand failed to pass legislation to protect abortion rights on the federal level, and while they have a 50-vote majority in the Senate, such a bill cannot pass unless they change filibuster rules. [...] Driving the news: Biden said Roe should be codified and that "the way to do that is to make sure that Congress votes to do that. ... And if the filibuster gets in the way ... we should provide an exception."