Speaker of the House Nancy Pelosi (D-Calif.) tacitly confirmed reports that have long circulated regarding moderate Sen. Kyrsten Sinema’s (D-Ariz.) opposition to raising corporate tax rates. Though her colleague Sen. Joe Manchin (D-W. Va.) has controlled headlines for months, Sinema has joined with Manchin on a number of key issues. Because of the Democrats’ razor-thin one-vote majority in the upper chamber, Democratic leadership cannot spare a single defection; But Sinema, like Manchin, has broken with the party on a laundry list of issues. Yet Sinema, as has been her tendency, has been unwilling to give her opinion on various issues to the press. A spokesman for Sinema summed up this attitude, telling reporters that “we do not negotiate through the press.” Even some congressmen have been in the dark on Sinema’s position. Rep. John Yarmuth (D-Ky.) admitted to reporters “I have no sense of what Sinema wants.” This uncertainty has …