In Michigan, Rep. Gary Peters, a Democrat, already has two declared GOP opponents:

State Rep. Marty Knollenberg, who sits on the state House committee that is drawing new boundaries for congressional and legislative districts for the next 10 years, is planning his own run for Congress in 2012. The Troy Republican said Wednesday he is submitting his paperwork to the Federal Election Commission and is employing Lauren Rakolta and Bryce Sandler to raise money for what he expects will be a long campaign. His likely opponent is U.S. Rep. Gary Peters, D-Bloomfield Township, who unseated Knollenberg’s father in 2008.

“My name is Inigo Montoya. You defeated my father. Prepare to be beaten at the ballot box.”

As the article notes, Michigan’s district lines will have to change, as the state is losing a congressional seat. The early speculation is that two of Detroit’s districts will be combined into one.

Peters’s other opponent would set up a 2010 rematch: “Republican Rocky Raczkowski, who lost to Peters in the 2010 race for the congressional seat, also said he’s planning to run for Congress again.” Raczkowski came quite close last cycle, winning 47.2 percent to Peters’s 49.8 percent.