Table: election_results_2006_6
Columns: district
incumbent
party
first_elected
results

Question: What is First Elected, when District is "Minnesota 2"?
SQL: SELECT "first_elected" FROM election_results_2006_6 WHERE "district" = 'minnesota 2'

Question: What is the lowest First Elected, when Party is "Republican", and when District is "Minnesota 1"?
SQL: SELECT MIN("first_elected") FROM election_results_2006_6 WHERE "party" = 'republican' AND "district" = 'minnesota 1'

Question: What is Party, when Results is "Re-Elected", when First Elected is greater than 1990, and when District is "Minnesota 4"?
SQL: SELECT "party" FROM election_results_2006_6 WHERE "results" = 're-elected' AND "first_elected" > 1990 AND "district" = 'minnesota 4'

Question: What is Incumbent, when Results is "Re-Elected", when Party is "Democratic", and when District is "Minnesota 7"?
SQL: SELECT "incumbent" FROM election_results_2006_6 WHERE "results" = 're-elected' AND "party" = 'democratic' AND "district" = 'minnesota 7'