Associated Press

The controversy over Internal Revenue Service targeting of politically active groups continues to deepen.

In the latest twist, congressional Democrats are stepping up their charge that the investigation so far has focused too much on conservative groups and ignored targeting of liberal and progressive groups.

Democrats, in a letter to Republicans, point to new evidence that progressive groups were being scrutinized. That includes a PowerPoint presentation from the Cincinnati office where the review occurred, and a newly discovered watch list. The new evidence suggests IRS workers in Cincinnati were actively scrutinizing liberal groups as well as conservative ones. The Cincinnati office reviews all applications for tax-exempt status…