Per Adam Schefter:
Raiders reached agreement on a one-year deal with former Broncos CB Tracy Porter.— Adam Schefter (@AdamSchefter) April 2, 2013
We knew Porter was on his way out of town. Whether he was an attitude problem (as suggested by Mile High Sports) or not, we'll let you decide.
Of course he had to sign with Oakland--everyone ends up with Oakland during their this-guy-could-have-an-attitude-problem phase.