Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Results | Candidates |
| --- | --- | --- | --- | --- | --- |
| Wisconsin 1 | Paul Ryan | Republican | 1998.0 | Re-elected | Paul Ryan (R) 62.8% Jeff Thomas (D) 37.2% |
| Wisconsin 2 | Tammy Baldwin | Democratic | 1998.0 | Re-elected | Tammy Baldwin (D) 62.9% Dave Magnum (R) 37.1% |
| Wisconsin 3 | Ron Kind | Democratic | 1996.0 | Re-elected | Ron Kind (D) 64.9% Paul Nelson (R) 35.1% |
| Wisconsin 4 | Gwen Moore | Democratic | 2004.0 | Re-elected | Gwen Moore (D) 71.5% Perfecto Rivera (R) 28.5% |
| Wisconsin 6 | Tom Petri | Republican | 1979.0 | Re-elected | Tom Petri (R) unopposed |
Question:
What district first elected a Democratic incumbent in 1998?
Answer:
Wisconsin 2