It begins: Mitt Romney got out in front of the debate on who will destroy senior citizens lives on Thursday, with this ad.

Now it's President Obama's turn at defending his Medicare plan and attacking Rep. Paul Ryan's:

The script:

NARRATOR: "Now Mitt Romney is attacking the President on Medicare?"

"The non-partisan AARP says Obamacare 'cracks down on Medicare fraud, waste, and abuse' and 'strengthens guaranteed benefits'."

"And the Ryan plan?"

"AARP says it would undermine ... Medicare and could lead to higher costs for seniors...."

"And experts say his voucher plan could raise future retirees' costs more than six thousand dollars."

"Get the facts."

And the Romney response, from spokeswoman Amanda Henneberg: “President Obama’s new ad ‘Facts’ gets the facts wrong. The facts concerning the President’s record on Medicare are clear: 1) Obama cut the program by $716 billion, 2) millions will be forced to lose their Medicare Advantage coverage and 3) the program will go bankrupt in 2024. Mitt Romney has a plan for Medicare that protects it for today’s seniors and strengthens it for future generations.”