user
Instruction
Answer the question based on the provided table.


Table
Table Title: United States House of Representatives elections in Colorado, 2008
Table Content:
| District | Incumbent | 2008 Status | Democratic | Republican |
| --- | --- | --- | --- | --- |
| 1 | Diana DeGette | Re-election | Diana DeGette | George Lilly |
| 2 | Mark Udall | Open | Jared Polis | Scott Starin |
| 3 | John Salazar | Re-election | John Salazar | Wayne Wolf |
| 4 | Marilyn Musgrave | Re-election | Betsy Markey | Marilyn Musgrave |
| 5 | Doug Lamborn | Re-election | Hal Bidlack | Doug Lamborn |
| 6 | Tom Tancredo | Open | Hank Eng | Mike Coffman |
| 7 | Ed Perlmutter | Re-election | Ed Perlmutter | John W. Lerew |


Question
how many incumbents are on the table


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["7"]