If Congress passes the Bipartisan Budget Agreement that was rolled out earlier this week, defense appropriators are ready to pounce on finishing a line-by-line spending bill by Jan. 15 to keep the Pentagon running for the remainder of the fiscal year, a top Senate Democrat said Thursday. Sen. Dick Durbin (D-Ill.), assistant majority leader of the Senate and chairman of the defense appropriations subcommittee, said that he had met Thursday morning with Rep. Rodney Frelinghuysen (R-N.J.), the new chairman of the…