Donald Trump was the first presidential candidate since Richard Nixon not to reveal his federal income tax return. Some Oregon Democrats want to try to make him the last. A bill introduced Monday in Salem would require candidates for president and vice president to give a copy of their most recent tax return to the Oregon Secretary of State with written permission that the document can be made public. Alternatively, the candidate could fill out Oregon’s standard income disclosure form for public officials. The requirement would apply to candidates on primary and general election ballots and those wishing to be...