Capital One, a Warren Buffett-backed consumer bank and credit card issuer, will acquire the credit card lender Discover Financial Services, according to a report by The Wall Street Journal that cited people familiar with the matter. Capital One has been working with advisers to "study a deal" to buy Discover and a deal could be announced as soon as Tuesday, per the Journal's report. Bloomberg reported earlier Monday that Capital One was considering making an offer for Discover. Discover has a market value o ...