Many Democrats campaigning for the Senate this year say they support suspending the filibuster rule to pass nationwide abortion protections. Some warn that Republicans will do the same to impose a federal abortion ban if they win control of Congress in November. But that may not be the case. Several leading Republican senators say they oppose changing the long-standing rule, even if their party retakes the chamber. The filibuster requires 60 votes in the 100-member Senate to advance most legislation. It's been a roadblock for the party in power to push its agenda, but it also can be changed by just a simple majority vote. Read moreThe Senate filibuster is a hurdle to any national abortion bill. Democrats are campaigning on it