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 |
| --- | --- | --- | --- | --- |
| Oregon 1 | David Wu | Democratic | 1998.0 | Re-elected |
| Oregon 2 | Greg Walden | Republican | 1998.0 | Re-elected |
| Oregon 3 | Earl Blumenauer | Democratic | 1996.0 | Re-elected |
| Oregon 4 | Peter DeFazio | Democratic | 1986.0 | Re-elected |
| Oregon 5 | Darlene Hooley | Democratic | 1996.0 | Re-elected |
Question:
Which Democratic incumbent was first elected in 1998?
Answer:
David Wu