(CNN) - Just a day after John McCain's campaign launched a TV ad attacking Barack Obama's readiness to lead in an international crisis, the Illinois senator unveiled a new ad Saturday that puts a new spin on the age old question: Are you better off today than you were four years ago?
The two-minute ad, "Defining Moment," will begin airing in key states on Sunday, according to the Obama campaign.
"At this defining moment in our history, the question is not, 'Are you better off than you were four years ago?' We all know the answer to that," Obama narrates. "The real question is will our country be better off four years from now? How will we lift our economy and restore America's place in the world?"
In order to "build the economy of the future," Obama says there has to be a focus on "urgent national priorities: reducing the cost of health care ... breaking our dependence on foreign oil ... and making sure that every child gets the education they (sic) need to compete."
The McCain campaign has fired back at Obama's new ad. “If Barack Obama is elected President, this may be considered the first in a series of 'defining moments' more commonly called job-killing tax increases," McCain spokesman Tucker Bounds said in a statement.
At a rally in Norfolk, Virginia, Saturday, Obama's No.2 discussed the ad and blasted the McCain campaign's tactics.
"You know how we’re finishing out the campaign? Barack is going up, instead of anything negative, we’re going up and laying out our plan to fix the economy. That’s what we’re running on," Sen. Joe Biden said. "What is the McCain campaign continue to do? They want to do anything but talk about the economy."
Updated 1:05 p.m. with McCain campaign's response