An independent group supporting President Obama's re-election is preparing a 30 million dollar advertising blitz in Ohio and five other battleground states for the fall. Priorities USA Action has reserved television ad time in September and October. It was founded last year by two former Obama White House staffers in response to the proliferation of Republican-leaning independent groups that arose after the U.S. Supreme Court eased restrictions on campaign spending in its Citizens United ruling. The group has raised 21 million dollars since its inception. At the same time, the conservative groups American Crossroads and Crossroads GPS have pledged to spend 300 million dollars this year.