President Obama's approval rating may be on the decline, but that hasn't diminished his star power as fundraiser-in-chief. In fact, demand for the president has grown in what will be a contentious mid-term election, with Republicans planning to sweep Congress. Since January, the president has raked in more than $20 million for Democratic candidates and committees, and he continues to draw supporters who pay thousands of dollars to hear and see the president, and take a picture with him -- for an additional cost, of course. How much exactly the president has raised is still unknown, since the administration is...