By Yael T. Abouhalkah, Kansas City Star Editorial Page columnist

President Barack Obama's war with Fox News moved ahead on several fronts late this week. And our prickly president continues to be on the losing side.

In one move, Obama's aides Thursday tried to freeze out Fox News from interviewing the administration's "pay czar," Kenneth Feinberg.

But the other media refused to participate unless Fox News could take part. Good for them. And, the interview went on.

Obama's attempt to freeze out a single media outlet he disagrees with failed, and rightly so.

In addition, advertisers could be the latest to find themselves being pressured by Obama's feud with Fox News.

Essentially, the President of the United States is boycotting the TV station. So, why shouldn't advertisers follow the president's lead -- especially if they want the federal government to look kindly on them?

Remember, given the feds' increasing reach into corporate America, all kinds of things are on the line now for private industry.

On Wednesday, just to take one example, the pay czar reached into the boardroom and -- correctly in my opinion -- reduced the compensation of more than 150 top executives at companies receiving U.S. bailout funds.

These executives plus others who have business or tax issues pending before the federal government could be wary about advertising on Fox News, thus poking the Obama administration in the eye.

Obama's war on Fox News has entered a dangerous period.

It's time to call a halt, retreat and end this thing before Obama loses even more credibility with the American people.

He needs to focus a lot more on important issues such as passing needed health care reform and strong climate change legislation.