Summary: U.S. Rep. Michele Bachmann, in addition to three likely Democratic opponents (Elwyn Tinklenberg, Maureen Reed, and Tarryl Clark), also faces a battle on a second front — a primary challenge from within the Republican Party (Chris Johnston and possibly Aubrey Immelman). … One-year retrospective: One year ago today, on the second day of his 2008 campaign against incumbent U.S. Rep. Michele Bachmann for the Republican nomination in Minnesota’s 6th Congressional District, Aubrey Immelman discussed the challenges for a self-funded political outsider in setting up a campaign office, building a campaign organization, and introducing himself to voters.