INDIANAPOLIS (AP): Interest in Indiana's three-year-old school voucher program is so high that the state could soon lead the nation in voucher use. More than 20,000 students have signed up for vouchers for the 2013 through 2014 school year. That's more than double last year's number. The Indianapolis Star reports the numbers put Indiana second in the nation for use of the vouchers. Milwaukee has more than 24,000 students enrolled in its program and Ohio has just under 16,000. Both of those programs grew slowly over many years.