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 | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Pennsylvania 1 | Bob Brady | Democratic | 1998.0 | Re-elected | Bob Brady (D) unopposed |
| Pennsylvania 2 | Chaka Fattah | Democratic | 1994.0 | Re-elected | Chaka Fattah (D) 89.3% Rick Hellberg (R) 10.7% |
| Pennsylvania 3 | Kathy Dahlkemper | Democratic | 2008.0 | Lost re-election Republican gain | Mike Kelly (R) 55.7% Kathy Dahlkemper (D) 44.3% |
| Pennsylvania 4 | Jason Altmire | Democratic | 2006.0 | Re-elected | Jason Altmire (D) 50.8% Keith Rothfuss (R) 49.2% |
| Pennsylvania 6 | Jim Gerlach | Republican | 2002.0 | Re-elected | Jim Gerlach (R) 57.1% Manan Trivedi (D) 42.9% |
| Pennsylvania 9 | Bill Shuster | Republican | 2001.0 | Re-elected | Bill Shuster (R) 73.1% Tom Conners (D) 26.9% |
| Pennsylvania 10 | Chris Carney | Democratic | 2006.0 | Lost re-election Republican gain | Tom Marino (R) 55.2% Chris Carney (D) 44.8% |
| Pennsylvania 11 | Paul Kanjorski | Democratic | 1984.0 | Lost re-election Republican gain | Lou Barletta (R) 54.7% Paul Kanjorski (D) 45.3% |
| Pennsylvania 12 | Mark Critz | Democratic | 2010.0 | Re-elected | Mark Critz (D) 50.8% Tim Burns (R) 49.2% |
| Pennsylvania 13 | Allyson Schwartz | Democratic | 2004.0 | Re-elected | Allyson Schwartz (D) 56.3% Dee Adcock (R) 43.7% |
| Pennsylvania 16 | Joe Pitts | Republican | 1996.0 | Re-elected | Joe Pitts (R) 65.4% Lois Herr (D) 34.6% |
| Pennsylvania 17 | Tim Holden | Democratic | 1992.0 | Re-elected | Tim Holden (D) 55.5% Dave Argall (R) 44.5% |
Question:
When mark critz (d) 50.8% tim burns (r) 49.2% are the candidates what is the party?
Answer:
Democratic