Senator Hillary Rodham Clinton is running a new television ad across Indiana starting today that highlights her Midwestern roots and casts her as a working-girl ally of the blue-collar Democrats she is counting on in next Tuesday’s primary here. Mrs. Clinton narrates the ad, titled “Dreams,” recalling her hometown in neighboring Illinois and describing her father’s work in the Navy and as a small businessman and her mother’s service as a Sunday school teacher. Their dreams, she says, are similar to those of all Americans who “embrace hard work and opportunity,” and she said she would fight for all of those hopes as president.