It used to be that incumbent U.S. House members in swing districts usually didn't get challenged in primaries by members of their own party. That truism has eroded in recent years, as political polarization is prompting more primaries from the left or right of sitting office holders. Montez Soliz is another example of the trend. The Rockford native said he's running against Democratic U.S. Rep. Eric Sorensen in the March primary for the 17th Congressional District in Illinois.

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