Sen. Joseph Biden (D-Del.) plans to release 10 years of his tax returns on Friday morning, pressuring his Republican counterpart, Alaska Gov. Sarah Palin, to do the same, Politico has learned.
The move is part of a fresh aggressiveness from the Obama campaign, which wants to discredit the new posture by Sen. John McCain (R-Ariz.) as the candidate of real change.
Disclosure, or transparency, is a big way for a candidate to make that case that during a campaign.