Starbucks CEO Howard Schultz has agreed to testify before a Senate committee investigating allegations of union-busting leveled against the coffee chain. Senator Bernie Sanders (I-Vt.) has been a vocal advocate for workers' rights and has recently released a book on Social Security and the future of jobs. The Senate panel was set to vote Wednesday to subpoena Schultz if he did not willingly agree to testify, but with Schultz now agreeing to appear, the vote is no longer necessary.