"In this way, we are in a similar position as our Founding Fathers. Just as they were called upon, we are being called upon. What they started, what they believed in, we must defend.
Day spoke just after Republican National Committee Chairman Reince Priebus said reelecting Obama would just lead to "four more years of failure."
"Republicans believe America's greatness comes from the American people, not the federal government," Priebus said. "But Barack Obama thinks the government is at the center of the economic universe.
"He thinks that if you started a business, 'you didn't build that.' Well how would he know? President Obama's never run a company. He hasn't even run a garage sale or seen the inside of a lemonade stand."
The convention started at 2 p.m. with 20 minutes of housekeeping, which included the election of Senate Minority Leader Mitch McConnell (R-Ky.) as the temporary chairman of the convention.