FILE - In this July 13, 2015, file photo, Wisconsin Gov. Scott Walker's son Alex, left, listens to his brother Matt, speak to supporters before their father announces he is running for the 2016 Republican presidential nomination in Waukesha, Wis. The former governor tells WISN-TV in an interview recorded Friday that his son Matt is interested in the seat being vacated by retiring Republican U.S. Rep. Jim Sensenbrenner. (AP Photo/Morry Gash, File)
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