Task: Data-Imputation (source dataset: WebTable)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Source               | Date               | Cantwell (D)   | McGavick (R)   |
|:---------------------|:-------------------|:---------------|:---------------|
| Strategic Vision (R) | November 6, 2006   | 53%            | 42%            |
| Mason-Dixon/MSNBC    | November 5, 2006   | 54%            | 38%            |
| Zogby/WSJ            | October 31, 2006   | 50%            | 46%            |
| Rasmussen            | October 30, 2006   | 54%            | 42%            |
| Mason-Dixon/MSNBC    | October 24, 2006   | 52%            | [MISSING]      |
| Strategic Vision (R) | October 20, 2006   | 51%            | 42%            |
| Rasmussen            | October 17, 2006   | 53%            | 38%            |
| Zogby/WSJ            | October 16, 2006   | 52%            | 45%            |
| Mason-Dixon/MSNBC    | October 2, 2006    | 50%            | 40%            |
| Elway                | October 1, 2006    | 53%            | 35%            |
| Strategic Vision (R) | September 28, 2006 | 49%            | 40%            |
| Zogby/WSJ            | September 28, 2006 | 50%            | 43%            |
| Rasmussen            | September 20, 2006 | 48%            | 42%            |
| Rasmussen            | September 12, 2006 | 52%            | 35%            |
| Zogby/WSJ            | September 11, 2006 | 50%            | 42%            |
| Strategic Vision (R) | August 29, 2006    | 48%            | 43%            |
| Zogby/WSJ            | August 28, 2006    | 51%            | 43%            |
| Rasmussen            | August 24, 2006    | 46%            | 40%            |
| Strategic Vision (R) | July 26, 2006      | 48%            | 44%            |
| Zogby/WSJ            | July 24, 2006      | 49%            | 42%            |
| Elway                | July 22, 2006      | 47%            | 33%            |
| Rasmussen            | July 17, 2006      | 48%            | 37%            |
| Strategic Vision (R) | June 30, 2006      | 47%            | 43%            |
| Zogby/WSJ            | June 21, 2006      | 48%            | 43%            |
| Rasmussen            | June 19, 2006      | 44%            | 40%            |
| Strategic Vision (R) | May 24, 2006       | 47%            | 42%            |
| Rasmussen            | May 16, 2006       | 46%            | 41%            |
| Elway                | May 5, 2006        | 52%            | 23%            |
| Strategic Vision (R) | April 26, 2006     | 48%            | 40%            |
| Rasmussen            | April 13, 2006     | 48%            | 40%            |
| Strategic Vision (R) | March 31, 2006     | 49%            | 39%            |
| Zogby/WSJ            | March 31, 2006     | 49%            | 42%            |
| Rasmussen            | March 20, 2006     | 49%            | 36%            |
| Strategic Vision (R) | February 15, 2006  | 48%            | 40%            |
| Rasmussen            | February 12, 2006  | 50%            | 36%            |
| Elway [15]           | February 9, 2006   | 55%            | 25%            |
| Rasmussen            | January 5, 2006    | 51%            | 36%            |
| Strategic Vision (R) | December 7, 2005   | 50%            | 39%            |
| Rasmussen            | December 5, 2005   | 52%            | 37%            |
| Rasmussen            | November 10, 2005  | 52%            | 37%            |
| Strategic Vision (R) | October 27, 2005   | 48%            | 39%            |
| Zogby/WSJ            | September 29, 2005 | 49%            | 39%            |
| Strategic Vision (R) | September 2005     | 49%            | 39%            |
| Strategic Vision (R) | August 2005        | 46%            | 38%            |



row_idx: 4
col_idx: 3
col_name: McGavick (R)
label: 37%