The Challengers: Why it will be hard, in a midterm likely to herald change, to oust a congressional incumbent in Minnesota

WASHINGTON — An election in November that will cap a tumultuous campaign season is expected to bring about change with the possibility of Democrats wresting control of the U.S. House and U.S. Senate from the GOP.

In Minnesota, voters could very well send most of the same people to represent them in the House and the makeup of its congressional delegation could continue to be evenly split, with four Democrats and four Republicans headed to Washington, D.C., next year.

And that is because of the power of incumbency, which creates an uneven playing field for challengers.

In the last three elections, the average reelection rate for a member of Congr...