Speaking in Berera, Ohio, the Senator offers a strong defense of his comments about tire inflation being an effective conservation tool. Watch video above.
"They think it is funny that they are making fun of something that is actually true... It's like these guys take pride in being ignorant."
Republicans have spent days mocking Obama's comments and distributing tire gauges marked "Barack Obama's energy plan."
Plus: A heckler wearing press credentials convinces Obama to recite the Pledge of Allegiance during event.
