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 |
| --- | --- | --- | --- | --- |
| Louisiana 1 | Bobby Jindal | Republican | 2004.0 | Re-elected |
| Louisiana 2 | Bill Jefferson | Democratic | 1990.0 | Re-elected In Runoff |
| Louisiana 3 | Charlie Melancon | Democratic | 2004.0 | Re-elected |
| Louisiana 4 | Jim McCrery | Republican | 1988.0 | Re-elected |
| Louisiana 5 | Rodney Alexander | Republican | 2002.0 | Re-elected |
| Louisiana 6 | Richard Baker | Republican | 1986.0 | Re-elected |
| Louisiana 7 | Charles Boustany | Republican | 2004.0 | Re-elected |
Question:
What is Incumbent, when District is "Louisiana 4"?
Answer:
Jim McCrery