In the bluest state in the nation, Republicans are all fired up and ready to go, and the Democrats could lose the US Senate seat held by the late Ted Kennedy. Yesterday, President Obama made a last-ditch effort to get Massachusetts voters to replace Kennedy with a Democrat. Will the "liberal lion" be replaced by a conservative who wants to kill Kennedy's dream of healthcare reform and scuttle President Obama's legislative agenda? We get the latest on tomorrow's special election and look at the Senate rule that makes it important nationwide. Is the filibuster a reasonable way to protect the minority or does it make a mockery of majority rule?