Originally reported by Dave Meltzer in the Wrestling Observer Newsletter, but that's a subscription service so can't link to it. From another site:
 

According to The Wrestling Observer, representatives from Indianapolis, Columbus, Ohio, Toronto and Philadelphia were in New Orleans this past week to meet with WWE officials regarding future 'Mania locations.

Columbus pitched the idea of holding a WrestleMania at Ohio Stadium, which holds 102,329 for football, meaning WWE could break the all-time attendance record.

http://www.wrestlezone.com/news/468317-possible-host-cities-for-wrestlem...

I'm not sure how realistic of a chance they have of getting it done, but this would be  a huge deal for the city. No matter what you think of wrestling, this event has a $60+ million impact for the host city and would arguably be the highest profile thing Columbus has ever done.