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 |
| --- | --- | --- | --- | --- | --- |
| Pennsylvania 1 | Bob Brady | Democratic | 1998.0 | Re-elected | Bob Brady (D) 88% Steven Kush (R) 12% |
| Pennsylvania 2 | Chaka Fattah | Democratic | 1994.0 | Re-elected | Chaka Fattah (D) 99% |
| Pennsylvania 3 | Robert Borski | Democratic | 1982.0 | Re-elected | Robert Borski (D) 69% Charles Dougherty (R) 31% |
| Pennsylvania 4 | Ron Klink | Democratic | 1992.0 | Retired to run for U.S. Senate Republican gain | Melissa Hart (R) 59% Terry Van Horne (D) 41% |
| Pennsylvania 6 | Tim Holden | Democratic | 1992.0 | Re-elected | Tim Holden (D) 67% Thomas Kopel (R) 33% |
| Pennsylvania 7 | Curt Weldon | Republican | 1986.0 | Re-elected | Curt Weldon (R) 65% Peter Lennon (D) 35% |
| Pennsylvania 8 | Jim Greenwood | Republican | 1992.0 | Re-elected | Jim Greenwood (R) 60% Ronald Strouse (D) 39% |
| Pennsylvania 9 | Bud Shuster | Republican | 1972.0 | Re-elected | Bud Shuster (R) unopposed |
| Pennsylvania 10 | Don Sherwood | Republican | 1998.0 | Re-elected | Don Sherwood (R) 53% Patrick Casey (D) 47% |
| Pennsylvania 11 | Paul Kanjorski | Democratic | 1984.0 | Re-elected | Paul Kanjorski (D) 66% Stephen Urban (R) 34% |
| Pennsylvania 12 | John Murtha | Democratic | 1974.0 | Re-elected | John Murtha (D) 71% Bill Choby (R) 28% |
| Pennsylvania 13 | Joe Hoeffel | Democratic | 1998.0 | Re-elected | Joe Hoeffel (D) 53% Stewart Greenleaf (R) 46% |
| Pennsylvania 14 | William Coyne | Democratic | 1980.0 | Re-elected | William Coyne (D) unopposed |
| Pennsylvania 15 | Pat Toomey | Republican | 1998.0 | Re-elected | Pat Toomey (R) 53% Ed O'Brien (D) 47% |
| Pennsylvania 16 | Joe Pitts | Republican | 1996.0 | Re-elected | Joe Pitts (R) 67% Robert Yorczyk (D) 33% |
| Pennsylvania 17 | George Gekas | Republican | 1982.0 | Re-elected | George Gekas (R) 72% Leslye Hess Herrmann (D) 28% |
| Pennsylvania 18 | Mike Doyle | Democratic | 1994.0 | Re-elected | Mike Doyle (D) 69% Craig Stephens (R) 31% |
| Pennsylvania 19 | Bill Goodling | Republican | 1974.0 | Retired Republican hold | Todd Platts (R) 73% Jeff Sanders (D) 27% |
| Pennsylvania 20 | Frank Mascara | Democratic | 1994.0 | Re-elected | Frank Mascara (D) 64% Ronald Davis (R) 36% |
Question:
How many parties is the incumbent Bob Brady a member of?
Answer:
1.0