Republican Presidential candidate Mitt Romney released his 2011 tax return on Friday. YNN's Zack Fink has more on the numbers and how the decision could affect the presidential campaign.

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UNITED STATES -- The question has been looming over Mitt Romney for several months now. After being criticized for the tax rate he paid after releasing his 2010 returns, it seemed unlikely he would make any more of his tax information public.

But after a difficult week, the Republican presidential nominee released his 2011 returns and a summary of all the tax returns between 1990 and 2009.

David Birdsell said, "He's coming out of a tough week. This allows him to say that he has answered at least some of the questions, the interesting thing is though they are not the questions from last week they are questions from four and five weeks ago."

Last year, the Romneys paid $1.9 million in federal taxes on $13.6 million of income. That is an effective tax rate of 14.1 percent. That rate is lower than what many people earning a salary pay, because Romney's income comes mostly from investments which are subject to a lower tax rate applicable to capital gains. Democrats, meanwhile, say this raises more questions about his off-shore holdings. And some believe this will not be the final word on this issue.

"If he believes that this gets this off the table and clears the air, it's too little, too late and it doesn't give the level of specificity about sources of income even if it answers in broad strokes questions about tax rate," Birdsells aid.

Elsewhere on the campaign trail, President Obama spoke by video to the AARP conference in New Orlena where he talked about Medicare.

"I have strengthened Medicare as President. We've added years to the life of the program by getting rid of taxpayer subsidies to insurance companies that weren't making people healthier," President Obama said.

Vice Presidential candidate Paul Ryan also addressed the same conference.

Ryan said, "The first step to a stronger Medicare is to repeal Obamacare because it represents the worst of both worlds. I had a feeling there would be mixed reaction so let me get into it."

In addition, both Romney and Ryan released letters from their physicians both of whom concluded that the two candidates are in excellent health.