Table:
text: United States House of Representatives elections, 2006
Wisconsin
Wisconsin
District Incumbent Party First_elected Results Candidates
Wisconsin 1 Paul Ryan Republican 1998 Re-elected Paul Ryan (R) 62.8% Jeff Thomas (D) 37.2%
Wisconsin 2 Tammy Baldwin Democratic 1998 Re-elected Tammy Baldwin (D) 62.9% Dave Magnum (R) 37.1%
Wisconsin 3 Ron Kind Democratic 1996 Re-elected Ron Kind (D) 64.9% Paul Nelson (R) 35.1%
Wisconsin 4 Gwen Moore Democratic 2004 Re-elected Gwen Moore (D) 71.5% Perfecto Rivera (R) 28.5%
Wisconsin 6 Tom Petri Republican 1979 Re-elected Tom Petri (R) unopposed

Question: Which district among the United States House of Representatives elections, Wisconsin 2006, was first elected Democratic incumbent in 1998?